I think the problem is with the inconsistency of the quality - not the lack of quality.
With other purchases, you have a pretty good expectation as to where the weaknesses will be in the quality of the item. With RVs, there is nothing to base your decisions against - the issues aren't consistent throughout a brand or a model. They are all over the place.
I buy "cheap" on a lot of stuff because I understand where the quality suffers and feel the cost savings are worth that loss of quality. I also buy "expensive" when I believe that they are providing me with a standard of quality that is worth the price.
With RVs, there is no way to know if A will be better than B - it's all a ****shoot as to whether you get a good RV or a POS.