I got 1600 or so coins at level 6, there are differences as the numbers you get seems to be somewhat "random"*.You will get higher payouts on higher levels. For example, you can get nearly 1,000 coins just for beating the sixth level. If you can play the game correctly, you will get there in less than 10 minutes.
The fact that you can't buy coins is just a big plus for me, I usually just skiped the slots anyway and I hope it will continue to be this way.
The slots wont return, at least not the way they are today, but I can see a games that is exactly the same whit a somewhat different look, called something else and don't require you to pay to play.
I agree that the JP game corner look much better.
What I want is a game corner whit many games, none of them will require you to pay, since EU laws would just stop that anyway, but you would be unable to buy coins. Why not just bring in some of the old games?
Roulette, Card Flip, Voltorb Flip, "Slots" and maybe something new. That would be good IMO.
*Computers can't be random.