[TanksAndSpartans]

Tennis13 touched on one of the things I was thinking, but articulated it better.

Say you quietly buy 5 PSA 8 cards over the course of a year (say Jim Brown rookies just as an example)

I'll use round numbers:

5*6K=30K

Then suddenly collude with someone to run an auction up to 17K

You now have 6 cards at a cost of 30K + 17K = 47K

The hope would be that 17K price acts a signal or whatever and the card gets hot. Even if the 6 are now sold over time, some auctioned off or however at 10K each (a bargain relative to the 17K price), you have:

6*10K=60K-47K=13K profit