I get 30 for main side. Sometimes it's a easy, sometimes, not so much.
It's tough to make a living as an AFF instructor however it will supplement your income enough to pay for jumps. Mind you, after 10s of thousands of dollars, you deserve as much as you can get.
It's also a lot of fun. I thoroughly enjoy doing AFF.
I figure it cost me about 42.13 to do an AFF after I figure in packing, wear and tear, and the occasional cutaway and reserve packjobs, Also factoring in the stress involved with worrying about whats going to happen.