Also, Aristocrat Slots seems to be giving out way too much money. I've found it to be reliably (though slowly) profitable; I've made at least 500 BC from it already (and then lost it all on other games...).
This is not unreasonable. Some online games get lots of aggravated players from random odds. For example, if you have a 50% chance to hit an enemy in a game, it's totally possible to miss them 15 times in a row.
So Aristocrats isn't paying out too much, you're just getting a streak. I won ~150 from it, then lost ~200, now I'm back up ~200+.
Let's put this way: You're just seeing your side, you don't know how many players are there and whether they're winning or loosing.
At the very moment you went up to 200+, somebody else (not in the same slot but on the same algorithm) went down that much.
Just like life: To someone win, someone else has to loose...