It really depends where you work. The clients will pay around $60-70 per session on average, but you get about $15-$17 on average.
CalState Fullerton's Rec center pays Certified Trainers $24/hour and CSCS $29/hour. However, that's not common.
It all depends where you work.
L.A. Fitness/24 hour, I don't know, but it's probably around $15/hour, but I'm just guessing, I've never worked there.
The shangrila of a CSCS positions in my opinion, is to be a strength coach of a Pro Football or DI team, stability, respect and general awesomeness.