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An auction can be scheduled based on time, and it's not impossible to auction off ten or twenty items.
Generally, large auction venues won't accept external items. Large auctions are often used by wealthy individuals for money laundering purposes, and in its early stages, the Dragon and Tiger Auction was also used to help Su Wanhu and Su Wanlong launder money. Using an auction for money laundering is exceedingly convenient.
Moreover, the amounts of money laundered each time were very large because the value of antiques can't be explicitly priced. You can auction them for as much as you want, so laundering money is extremely simple. However, as Su Wanlong and others whitewashed their ventures, the Dragon and Tiger Auction lost its money laundering function and began to become genuinely commercialized.
