In planning a trip I reached out to a guide that is in the RS books and videos and spoken very highly of in these forums.
The quote is high, but not so much to reject it outright. My real hesitation comes from the fact that he specified, right off the bat, that the payment was to be made in cash. I suspected, and have since confirmed, that requiting cash payment for more than 20-30euros is illegal in that country—famously one of the worst countries in the EU for tax compliance.
Am I being silly? Should I tell him why I'm not booking him? Should I write in to the RS guidebook dest to let them know they're promoting a tax cheat?