This is something that I haven't seen implemented in a casino/gambling website, but it most certainly works elsewhere. Gamification is often implemented in places of study, so as you progress through the course, you earn badges, and achievements. We already know how addicting it can be to collect achievements, because Xbox, and Playstation has been doing it for a long time now. I don't know why more gambling places don't implement a similar system. You could effectively convince the player to think they are winning, by rewarding them achievements, while they are losing money potentially causing them to keep that feel good factor, and gamble more than they would normally. It might not be entirely ethical, and I'm not saying that they should implement it, I'm just surprised there isn't more utilizing this.
There is an element of gamification on certain websites, where frequent players are rewarded with more bonuses, a certain amount of wagered money gives you tickets to different tournaments and giveaways, which otherwise would've cost a lot of money.
From what I know, Roobet has advanced pretty well in that field, they have different levels for users, and with more wagering, a player can progress to a new level, which opens up new opportunities.
That is a good client approach (for the casino, of course), not only this makes customers happy once they lose, but also retains them and prevents from playing on other websites.