One cannot know what his motives are or where his intentions lie with just this information. Sure, he might be doing this just for the money. He might also be loaded and is doing both jobs simply because he finds purpose in helping others.

What did the doctor who gave you his name say about him? Have you heard anything about his reputation?

As for the short-term concern, for me personally, I'd be happy to have my psychiatrist turn me over to my primary doc. It's basically just periodic visits for a med check-in. No reason my primary doc can't manage this for me. So maybe my psychiatrist makes me see her just for the money?? Who knows. Maybe you could straight up ask this guy what his reasons are.