I had never heard of any of this shitte before, but apparently there are a large growing category of computer/phone/tablet games called “Free-to-Play” (or F2P) that use highly sophisticated psychological manipulation techniques to induce players to spend money to “upgrade” their experience of the game and progress faster and/or farther than otherwise. And some players spend thousands of dollars per year doing so!
Here is an interesting quote from the linked article:
“Hard” Boosts include things like the random rare creatures that are sold in PaD for $5 each. Having these in your stable effectively lowers the difficulty of the game enough to allow you to get a little bit further with each purchase. A technique that is very popular in Asian games with hard Boosts (PaD included) is to allow hard Boosts to be “merged” to allow for even bigger hard Boosts. This makes the math involved in figuring out exactly how expensive a very high quality hard Boost will be, daunting. It may even be completely invisible to the consumer due to the various drop %s being hidden. Thus the best hard Boosts in these games typically cost thousands of dollars, a fact that is hidden to the user until they are already invested for at least a few hundred dollars. This puts the consumer in the difficult position of giving up and losing the equity already purchased, or going “all the way” and spending some unknown large amount to get the top Boost. Some of these techniques, sometimes called “kompu gacha”, are already facing regulation in Asia due to their excessive layering and lack of transparency.