How do collectors establish relationships with auction houses?

The direct way is usually the easiest way. That is: buy and sell art.

Why do some of the most savvy collectors in the whiskey industry turn to auctions such as those held by Sotheby's to build out their own shelves? - Quora

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Why do some of the most savvy collectors in the whiskey industry turn to auctions such as those held by Sotheby's to build out their own shelves? - Quora

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What is the best way to establish a relationship with an auction house? - Quora