[Bram99]

As for vintage cards, every card is like a snowflake. No two of them are exactly the same condition, centering, color, registry, gloss, etc. If you like a card, why not own more than one of them? Wouldn't you rather have two 1841 PB Greenberg's than one Greenberg and a Camili, Donald, and Arnovich? (No offense to the Camili, Donald, or Arnovich collectors out there)

Both scenario's have similar value, but I would bet that you as a Greenberg collector would get more happiness out of the two Greenbergs.

As one reply mentioned, some people collect players, some collect sets, some collect teams, all of which can be put on a registry.

I think the PSA registry is missing one more important category: the single-card ladder. Why can't someone collect a single card in each grade from 1-10? That would be pretty cool to have as well.