I also think that is very attractive to play on site where we have some chance to hit the jackpot, I know how precious are these feelings when somebody hit the jackpot, it happened to me 3 times till now, so these kind of things keep us coming back.
But don't tell me you never join any kind of game that related with money? well, I don't think so, because for sure you also have losing and winning moment of your life in gambling but most of the time you lose so that you don't want to accept it. And now your just thinking that gambling is just wasting of our money. BUT that was just my opinion.