I've played CS:GO and got like 0.05 BTC out of it. A month or so ago they decreased the sat./kill rates so I stopped playing, because it was not worth my time. 100 satoshi/kill is very low. The rates are set back to normal now (1000 sat./kill), so I'm playing again.
Sadly there are really few people on the promo servers, but in 1v1 me and my buddy can get ~100k sat. in 30 min, so that's not that bad. If the servers were full, it'd soooo much fun to play.
I like the new 1st place system too. You get 2000k sat. if you have the most points in a 3 day period.

All in all it's a great place if you're bored and you want to get some money by having fun.