I don't want to turn this into a political discussion, but, frankly, government regulation is killing the salvage business.
I have two good friends who are in the business, and one told me flat-out that he thinks that the government is regulating that industry to the extent that it is so that they will indeed close the doors.
Trust me, vintage salvage yards aren't getting rich.
On the other hand, late model salvage yards are getting rich because of things like aluminum rims, catalytic converters, starters, alternators, air bags, etc etc.
To say the answer is that vintage salvage yards just "lower their prices" is just, well...uninformed.