I still play on my PS3, just bought 2 games for it on the mid-year sale (Sports Champions 2 and Ratchet and Clank Future: Tools of Destruction).
I have some backlog on it. I don't buy a full price retail physical release for quite some time, just PS+ games and AAA titles on sale. A lot of flash sales include great PS3 games for cheap. Recently, I got Uncharted 1 and 2 for 5 bucks each.