I Transmigrated into a Male-Oriented Power Fantasy and Lead My Sisters on the Path to Immortality

I transmigrated into the auction house chairman of a wish-fulfillment novel aimed at male readers. The male lead puts his wife up as collateral at the auction, then gets his buddies to join him in a free shopping spree. Even worse, he wants to add me to his harem, too. I clap my hands, and a crowd of Mahayana cultivators appears behind me. This is hilarious. In a fantasy world, why would I run an auction house without a powerful backer?