Gambling addiction is a big addiction. And behind this addiction the main reason is money or BTC, you lose money but again you go back because you think that may be you can regain your money. In this world everyone have this greediness and you are not out that. Everyone think that money can give all the happiness that why everyone ramping behind this. so its simple.
I think younare partly right, the reason why people are addicted to gambling is mainly because of money, or BTC as you said, though there are people who goes back to casinos or gambling sites because it is really fun, haply and entertaining, they treat gambling as an entertainment. People on the casinos are really lively and fun, everyone who goes in a casino will be finding a lovely and lively crowns because that is their like, to have fun, though they can't deny that they are also hoping that they will win.