A pack of trading cards, a video game loot box, and a dealt poker hand share one design feature. The reward is uncertain, and the player cannot predict the moment it arrives. That single property explains a large part of why all three hold attention. Psychologists have studied the pattern for decades, and the findings map onto games that look unrelated on the surface. The mechanism is old. The products built around it keep changing.
The Reward Schedule Behind All Three
B.F. Skinner described the mechanism in the 1950s. A variable ratio schedule delivers a reward after an unpredictable number of actions. Skinner found that this schedule produces the highest and steadiest rate of response in his animal experiments, higher than any fixed pattern of reward. A pigeon kept pecking the key long after a predictable payout would have stopped it.
The human version runs on the same wiring. Dopamine neurons respond most strongly to rewards that were not expected, a result documented by Wolfram Schultz in his work on the brain’s reward system. A predictable payout produces a smaller signal. Uncertainty, more than the prize itself, drives much of the pull. Each of these withholds the outcome until the last moment, which is precisely when the response peaks. The effect predates any of these products. Designers arranged their systems around it.
The Real Product Inside a Card Pack
A booster pack costs a few dollars and holds a fixed number of cards. Most are common. A small fraction are rare, and a smaller fraction are the chase cards that carry real resale value. The buyer knows the odds are poor and opens the pack anyway. The Pokémon Trading Card Game has seen record demand, with sealed product reselling well above retail and individual cards trading for five and six figures at auction. Reports in 2025 noted that certain graded cards outpaced the return of the S&P 500 over comparable periods.
The card itself is only part of the product. The other part is the second before the reveal, when any card is still possible. Manufacturers understand this, which is why packs are sealed, foil-wrapped, and sold one at a time. The wrapper exists to preserve the uncertainty until the buyer pays for the right to end it.
A second hook sits beyond the single reveal. Collectors chase complete sets, and one missing card turns every future pack into a targeted purchase. The manufacturer benefits twice, once from the gamble on rarity and once from the pull to finish what the buyer started. Set completion converts a one-time buyer into a repeat one, and it does so without changing the odds inside any single pack. The randomness sells the first pack. The unfinished set sells the next dozen.
The Question of Control
Poker occupies an unusual point in this comparison. The deal is random, but the decisions after it are not. A card pack gives the buyer no agency. The outcome is set the moment the pack is printed. A poker hand offers choices about betting, folding, and reading opponents, and those choices decide most results across a long session.
That difference matters when people group playing online poker with pastimes like opening packs or spinning a game’s reward wheel. The random element is shared. The room for skill separates them. A player can study and improve at the table, which a sealed booster never allows. This distinction sits at the heart of poker psychology, where long-term results depend on decision-making rather than chance alone.
The Tuning of Reward Systems
Modern reward systems refine the basic schedule. Some markets force publishers to disclose loot box odds, while others let the drop rates stay hidden. Some games add a pity timer, a guaranteed reward after a set number of failures, which keeps a discouraged player engaged without removing the randomness that does the work. Limited-time availability adds pressure, since a reward that leaves the store next week converts hesitation into action.
Card products use similar tuning. Print runs are managed, special sets are released in limited windows, and premium packs promise better odds at the rare tiers. The result is a system that looks generous while remaining tightly controlled. A player feels close to the good outcome often enough to keep going, and the actual probability of the top reward stays low.
The Near-Miss Effect
Slot machine research introduced the near-miss effect to the literature. A near-miss is an outcome that falls barely short of a win, two jackpot symbols and a third that stops one position off. Players treat these outcomes as encouragement, and they keep going. Brain imaging shows near-misses activate some of the same reward regions as an actual win.
Poker contains its own version. A drawing hand that misses on the final card produces a comparable response. So does a strong hand beaten by a slightly better one. The player was close, and closeness feels like a reason to continue. Card packs produce the effect when a booster holds the second-rarest card instead of the one the buyer wanted. In every case, the system delivered a loss that the brain files somewhere near a win. The response keeps a session going a little longer than the odds alone would justify.
The Limits of the Comparison
The three activities are not equivalent, and the psychology explains why. Researchers who study gambling and the brain place loot boxes near slot mechanics because both hand the user an uncertain reward and ask nothing else. Loot boxes and card packs sell randomness as the product. The purchase is the action, and the outcome follows without further input. Poker charges nothing for the cards and settles results through play. Money moves based on decisions and the behavior of other people at the table. A skilled player can lose a hand and still profit across a month, an outcome no card pack can offer.
This is why regulators in several countries have examined loot boxes under gambling law while treating collectible cards and games of skill differently. Belgium restricted paid loot boxes in 2018. Other governments have debated rules that would force publishers to disclose drop rates. The argument turns on how much the outcome depends on the buyer and how much depends on chance.
The Design Behind the Pull
The shared feature is uncertainty delivered on a schedule the player cannot predict. That single design choice is present in all three, and it accounts for a large part of their hold on attention. Recognizing it changes how a person reads the moment before a reveal. A pack has already decided its contents. A hand stays open because what happens next depends on the player. Knowing which of the two situations you are in matters, and it is the one piece of information the design tends to obscure.
Conclusion
Loot boxes, trading card packs, and poker may all rely on uncertainty to capture attention, but they differ in one important respect: the role of player control. Understanding how reward schedules, near-misses, and perceived control shape behavior makes it easier to recognize why these experiences feel so compelling and where the line between chance and skill begins. Looking beyond the reward itself reveals the psychology behind the design, helping players, collectors, and enthusiasts make more informed decisions while enjoying these experiences more consciously.