Because Roger would have left the show just like it was. Bob and he were sticklers about the show being almost live-to-tape, they didn't like change, at least drastic change. By the time Bob left, the show was stale. The prizes were bland, with the exception of the occasional Caddy, Lincoln, or Vette. The show was stuck in a bygone era, and that's just how Roger (and Bob) liked it. It was easy. If Mike had been a carbon copy of Roger, the show would've been canceled by now. I agree that Mike's first bit in his role at Price was rocky, and he made a lot of drastic changes much too quickly. However, once he got acclimated, he did a very good job of turning things around and making it a show fit for today's style and demographic while keeping the core of the show what it always has been.