I never play Casino games on-line, I know from experience that the games are rigged towards the House otherwise they would not make a profit, and when I say "Rigged" I don't mean Crooked in anyway, but that is the nature of the game.
Slot machines in real life are set to percentage pay-outs and have to be set according to limits agreed on by the gaming commission in the area (State) or in the UK. The local Council's.
That limit has an Upper and Lower limit, usually around 75 to 85 Percent, I know of some Casino's that set the limit higher than 85% but that is not illegal as it pays-out more to the player, but if they went below the 75% they could face prosecution because they are basically stealing off the public.
How do I know all this? Because my Wife was a Manager in one Arcade that had 3 different owners over the time she worked there (16 Years) and the owner who made the most profit was the first one that had the machines set at 90%, Because his motto was to make a little at a time but had more customers.
As the limits went down, set by new owners the customers started to drop, because they noticed a difference in the Pay-outs and stopped coming, So the first owners had the right Idea, setting the machines to a higher limit brought the customers in because they had a decent return on your money.
Personally I only play Casino games in a real Casino if I have got there early for a Poker Tournament and have to wait for the game to start, but I set my own limits on how much money I am willing to lose, and I never chase my losses because that usually makes you a bigger loser!
When the fun Stops, STOP!