Where do all the high end cards come from ?
 

How do the big players, 707, BMW Sportcards, etc, have and absolutely endless supply of big dollar/high end cards ? How do they obtain all these cards ?

Network
 

I think it's all in the network these dealers have. They are well known, make it known they are buying premium cards, and in particularly the case of Levi at 707, puts himself in position through the number of shows he attends to make such purchases.

When I was a kid in NYC there was a joke that all of the Chinese food in the city was whisked to the restaurants via conveyor belt from a secret factory under Central Park. Perhaps there is a secret card factory out there somewhere that provides a supply to the Rolex crowd?

At the prices they list their cards at I highly doubt they sell many.

I see the same overpriced BIN auctions month after month

Plus... Topps cards are very plentiful in high grade slabbed and raw, and always will be.