When I was looking for my Bus, I looked at a lot of RV websites at Prevosts, I went to RV Shows, I spoke to Dealers. There was no unbiased resource out there. Salesmen and people selling their coach is not a reliable guideline.
POG helped me confirm baseline pricing. That was very helpful.
POG had no dog in the race. It was helpful and one of the reasons I originally joined.
Whatever Price guidelines say, they are still very general and flexible. At some point, it needs to be updated.