Posted By:
Rich Klein Relatively inexpensive is that for quite a while in the 1980's P/S Signed cards were one of the most common items to be signed at trade shows.
I'd say as a guesstimate (without anything more than memory and instinct) that for many of these players more than 50 Percent of the P/S cards were signed which means that there is a supply of 5,000 signed P/S cards of some players. And I would venture that there are not 5K collectors of P/S cards currently active. Simple economics; More product than people willing to purchase.
Of course, I could be very wrong; which is not always unusual for me 
Regards
Rich