Was the Hugh Finn case contested this vigorously?
No, it wasn't. And had Terri's father not managed to smuggle in a video camera and shoot some footage of Terri, her case wouldn't have been contested this vigorously either, and Michael et al. probably would have gotten about $500,000 from the trust fund.
I see no reason that Michael would have believed, in 1997, that he would have to spend over $500,000 of "Terri's" money in legal fees to get his wife killed. Thus, I see no reason to believe that money could not have motivated the Schiavos' testimony about Terri's supposed "wishes".