I know that it's said that you should gamble the amount that you can afford to loose, but will you call it a true fun when you know that there's a higher probability of losing your bet?
If you're not comfortable with that fact and you cannot have fun knowing that there's a big probability of losing then don't gamble, casinos are business operated to make profit its not cheap to set up an online casinos the cost is too big and this is not a cash cow of people, though some people tries to make it as their cash cow.
You can try the easy way and that is by accepting that your chance is 50/50 and have fun with the games or the hard by trying to make the casino you're cash cow but expect to get disappointed because the house has an edge and that edge will play out anytime, so if you're already winning and you think that calling a day is a good idea then do so, or you could lose your winning and will have to chase your losses and eventually get disappointed.