I never counted, but I think I have much bigger losses than gains. It is not hard to conclude that, but the thing is I never had big expectations of gambling. Sometimes I try out the site I find on forum and sometimes I just play on sites I already tried.
I mostly set a limited budget that I am willing to gamble and then count the losses in the end. I don't gamble with expectations to earn money.
I don't keep track of my money spent and earned from gambling and betting, but I can definitely say that I'm in profit because I always try to play with bonus money and invest my own money only when it will give me even more bonus money. And in the end, the only thing I'm bad at is slots. I've been losing there constantly lately and a couple of my attempts to improve the situation have made it worse.