Dead right, no its not healthy,but this same question has been largely asked for decades.
Once a price of something starts to rise all the chancers come out of the woodwork,[or in the case of this forum, a van at Kempton].
I saw it in the late 70s early 80s people paying silly money for rubbish,but that bubble burst.
Lately I have been browsing old Classic Motorcycle mag and have been wondering where have all the bike in those long lists of stuff for sale gone to?
I think an awful lot is just hoarded, think of that silly shed programme and the vast collections of dusty barns they "uncover."
A well known dealer who has pages of the stuff in the mags is reputed to have a couple million quids worth stashed away, class bikes of the kind which never appear in his lists.
When people cannot afford even a mediocre 350 because of its alleged worth that tends to drag up the prices of junk,old mopeds, french tat and so on.
These things have peaks and troughs but I doubt the next trough will be so low as to make bikes in demand very cheap. Those days are gone for good.
People also fall for bullshit for some makes, Vincents for one, ok bike but not worth the money asked, and as for Broughs, I stuggled to get £900 for an SS80 and petrol tube sidecar chassis back in 1980; I knocked it out to another dealer for what I paid for it, never touched another since.