Maybe they just haven't found this forum yet...?
I do know this: with the real estate market as overheated as it's been, a whole lot of folks have been taking advantage of the insane valuations in their homes, taking the money and "going mobile" in RVs (including pop-ups) until things cool down and they can afford to buy back in again.
As a result, your everyday, average pop-up has gone from relatively affordable to crazy expensive, and that's IF you can find one! We actually had to get on a list with a local dealer and wait for a USED pop-up to come available!
If past is prologue, though, the housing market will cool and maybe we'll see a spike in availability of lightly used RVs and pop-ups at much more reasonable prices as folks return to fixed housing.
We can dream, can't we?