With a competition/competitive benchgun, the condition of the barrel is everything and, if you intend to buy a secondhand gun, you must assume the barrel (be it 6.5-06 or 6PPC) is past its best. So, really you are buying (or selling) a secondhand action, trigger and a secondhand stock. Unless you are regularly shooting these in competition and have some results to prove they are still shooting to benchrest standards.
It's such a small (but discerning) market - we have maybe two dozen 100 yd BR shooters in the UK - and it's not growing. I could probably list 10 guys who have a 6PPC gathering dust.
600/1000 yard BR is far more popular, with 60 - 70 shooters regularly competing but your 6.5-06 is perhaps not a fashionable cartridge. Ten years ago, the 7mmWSM was king but 400 rounds barrel-life........... Now, smaller cartridges like the 6BR, Dasher, BRX, 6.5x47 etc. are most popular.
Love that Hall action though......