Do registry set builders look to eBay or auction houses to upgrade?
A 1970-D PCGS MS67 Kennedy sold last month in an HA.com auction for $6300. I assume this coin will go into a registry set.
Yet, I see that a 70-D P67 Kennedy is listed as a BIN on eBay for $5000., definitely less of an outlay of funds to acquire this low pop key coin of the JFK 50C series. (And, no, I do not own the coin.)