Sony needs to re-release some of those old lenses just to keep the prices sensible.
You are absolutely correct. As an example, the local price here for a Nikkor 35mm f/2 is $342.17 CDN (brand new). In general, the pricing of the used Minolta lens is comparable to thier (brand new) Nikon counterparts and Canon can't be too far away either.This is likely causing potential buyers to look at other options. It worked for me.