I think another factory (and sorry for hijacking your thread) is camp site fees. Now I don't have a lot of experience with this. I know Mammoth 8 years ago right on the lake (no hook-ups) was awesome.. I think $79 for the week, but I've also seen 'nice' full hook-up places that are the same as a damn hotel.
Richard H, you seem to be like chEFF, someone who gets their use out of it, probably less than 1% of folks who own RVs/THs.
After last season blowing the motor in each of my 2 SXSs (1 week apart), I was trying to 'calculate' seat time in the toys vs. how much time I spend getting everything dialed in, working, cleaned, the travel (tow) driving which I don't like, etc. The ratio is probably something like 25-50 ,.. maybe 100 hours to each our of seat time. .. but again, where can you drive something like a crazy person, grinning ear to ear in such a beautiful place. I can't see ever bailing...
OK, Hi-Jack over... back to work.. ugh..
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