TANSTAAFL. (There Ain't No Such Thing As A Free Lunch.)
No one can afford, as a TPA, to provide excessive handholding/telephone time/letters/client visits, etc., for a client who refuses to help themselves, without charging for it. Either the base fee is higher, or there will be hourly charges, or maybe some revenue sharing, or some combination, etc., etc...
Or at least no one can afford to do this for free for very long. Those people are called former TPA's.
Most good TPA's will provide as much service as you want/need. So the question is: how much is the client willing to pay? If he requires lots of service but isn't willing to pay reasonable fees for the time/services required, then most TPA's are going to drop him as a client. (Well, maybe I shouldn't speak for others - I'll just say that WE would drop him.)