How do collectors establish relationships with auction houses?

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

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

How does an aspiring historic art collector with several thousand dollars saved find pieces to bid on to start their collection? Most online auctions seem to have ended already. - Quora

What is the record for the highest selling price of a camera at an auction house like Sotheby's or Christie's? - Quora

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

What does it take for an artist to have their works listed on prestigious auction houses like Christie's or Sotheby's? - Quora

Why do auction houses charge a buyer's premium? - Quora