What are the brands/models you speak of?
For instance Canon and Nikon manual focus. More so for autofocus models.
It very much depends on model. Some models never make it onto the shelves, but just go into rummage boxes, may they be junk or mint.
Lomography has some unique models, with features not offered in the long past. These, in spite of their prices, seem worth considering. Many others offer far less than than old cameras from fleamarkets or out of rummage boxes to be had for a fraction. With used ones of course there is the risk of them having faults, plain or hidden. Here it depends on ones expertise to decide.
These days I bought at a camera store a 6x6 with telescopic barrel, F2.9 75mm Cooke triplet lens, front-element focusing and 200, 100, 50, 25 , B , self-timer shutter with on-body release, a very basic Galilei finder.
Paid 15€ for it. What would you pay for such at Lomography for a new one?
As indicated, I hear sometimes, or rather rarely an analog photographers uttering that he would love if a camera with certain features would be (had been) produced, but I never heard anyone asking for new cameras in general to be made.