Jiang Li was a professional. He knew a 'master' like his soul-client was paid a large sum per session and the pay was directly proportional to how high the expected performance from him was. This was why no matter what garbage was presented to him for on-the-spot appraisal, he didn't hesitate to give a smile and exaggerate the worth of the item. There was only one goal, to make its price reach sky high.
He was helping both parties this way. The auction house earns more, and he too would get a large commission, while the rich bidders' wallets would thin down, ridding them of the headache of worrying where to spend their surplus money.
It greatly helped that 'Master Yue' had a dependable reputation, hence as long as he gasped, widened his eyes, and acted surprised or amaze, people downstage would fall for it and think whatever the auctioneer presented was awesome.
Moreover, from time to time, he would talk loudly to offer his insight.
Thanks for reading. Corrections/suggestions welcome.