I think there's some modest money to be made in a pay-for-play scenario if you have the skills. I turn down a lot of drum-for-hire offers simply because I don't know the people or I'm not interested in the material. But usually if I know them I'll cut em a deal or just do a one-off for free. I'm about to do a whole album for a guy in here. I've "worked" with him before and I like the guy and his music, so no problem. He can't get real drums as cheap as I'll do them for him, and it'll make me a little extra money for something I don't mind doing anyway. Win/win. But I don't think I'd want to make a job out of it.