Okay, I have to admit it, when I was still gambling, I was there and answer an invite because I was looking for a way to earn bitcoin that time.. Other than profit, I have no other reasons why I am there, though I could say that I was having fun chatting with the people on the gambling site, so I think it's more of a profit than looking for fun...
Most of the people here that's the main goal why we are gambling only few people says that they are gambling for fun.
That's given as they gamble they don't have choice but to enjoy their bitcoins or money because its either they will win or lose.
And some of them saying that they just gamble for fun to cover up the reality that they lose most of the time.