A lurking SWL listener here. Was wondering something about receivers in
general. Why is it that all-band receivers are generally more expensive
than HF-only receivers?.... simple AM radio tank.... An AM/FM stereo
radio is cheaper in many cases than a similar radio with SW bands.....

Don't forget economy of scale.

I suspect many more HF-only compared to all-band receivers are sold.

AM or AM/FM radios are sold by the gazillions; undoubtedly many, many
more than are sold with a SW band. Don't know where you are from,
but just think of the ubiquitous AA5 (All American 5-tube AM radio)!
--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
NRA Life Member & Certified Instructor for Rifle, Pistol, & Home Firearm Safety
Also Certified Instructor for the Kansas Concealed-Carry Handgun (CCH) license