Charging extra on service for non-locally purchased RVs

I got an discount card from my RV dealer when I purchased my RV there that is good for service and at the accessories store. It is just a way to thank a customer and nothing else.

When I saw this thread I thought it was about something more like this - We priced a new RV at a dealer who said to us, if you don't buy from us we will not do warranty service on any RV that we don't sell to you. That sent me directly to another dealer.