Yep! Its word of mouth. If someone asks "what do you think of this guy?" and gets an answer "well don't know him but I've heard..." It up to you if you hunt with him. Its the same with say gunsmiths. "What do you think of this guys work"...."Never used him, but he stuffed up a mates gun" same could be said with mechanics/builders and so on.

If a guide was kicked off someones land for shady reasons, would you (a client) like to know about it?