There is no set profit for gambling and you should never see gambling as your main source of income. If you have more money then you can enjoy gambling some money as entertainment. But in gambling your luck is more dependent so if your luck is good you can earn more money.
Of course, when playing gambling we must be able to control the finances that we are at stake because we have to use some of the money we have for daily needs, and in gambling we are willing to lose the money we have and if we lose, we are ready to accept it. So someone who plays gambling must be disciplined and careful not to overuse his money, because gambling cannot be predicted that he will always win, he may lose and we are ready to accept that risk.Might be easy for us to say but I bet that up to now, we or it's just me, sometimes go overboard even for just a little bit, not because we chase our losses but for some other reasons that enticed us to go over the supposed betting budget. It's not that we don't know about this at all as we've been gambling for years now, it's just that we are still humans which makes us prone to make some mistakes which are quite inevitable specially when it comes to gambling. In the end of the day, it is what it is.
Too much optimism. In fact, any consecutive day-to-day wins should be taken as a miracle, especially if it is not Martingale that is able to give such winnings but in the end leads you to a huge loss. 
