Thanks for your feedback, I did not think that people mainly gambled to earn money. I mean, it makes sense that people want to increase income, but I thought is was pretty obvious that the majority of people loses money in this field and only a couple of games even allow theoretically to have regular income.
OP can we have some options added to the pool like "want to try my luck",because my main reason for the gambling is to try my luck from time to time which maybe fall under get some excitement option but still trying luck is more on to the point why we are gambling.
Good suggestion, I also want to suggest OP to add "spending spare time/having fun/entertainment" although most people gamble for money but I myself gamble for spending spare time as well as spare money obviously and I believe I'm not the only one who gamble just for fun. Or maybe having fun is something which is considered as "its just a habit"?
I added both of the options, thanks for suggestions. Well, I guess it could be considered a part of the habit, but it still deserves to be a separate option, because when I wrote 'habit' I meant something people do on regular basis without getting anything positive out of it, while if people gamble during free time, they probably feel like there's something pleasant in it for them.