A guy I know guides for smallmouth on the New River in WV. Typically these are rafts with a single oarsman (guide) and 1 or 2 fisherman. When asked the same question he said "$100 will make sure I take you as a client in the future....$50, well, I'll entertain you again only if I have no other clients (even first time customers) scheduled and need the money." Granted it is a specialized trip with whitewater, and they have more clients than time.
None-the-less I was a little surprised at that high of a figure. Thought to myself, "well good thing I don't need a guide then......"
Learn to not run from your problems....except when your problems are giant boars.