Huangfu Wu flaw had no real interest in the antique market, because... that market just wasn't very interesting.
Common folk would say, in times of peace collect antiques, in times of chaos hoard gold. The value of antiques came to the fore only during prosperous times.
In short, the value of antiques lies in collecting; they're not hard currency. As for antiques in the Cultivation World, they are even less useful.
Certain antique magical artifacts and treasures did have some practical value, but so many had been appraised by various individuals that it would be truly difficult for Feng Jun to find any overlooked treasures.
The materials market, where he first tried his luck at finding bargains, offered far more opportunities.
The next day, as it was still raining, Feng Jun and his group made another round through the antique market, and then left.
He pulled Shangguan Yunjin aside and muttered to her for a while. Shangguan Yunjin then went back in with Yu Changzhu.