Huang Fu Wuxia didn't want to notify Master Ju precisely because of his extremely high status in the Cultivation World.
The Four Great Sects were already akin to four titans, and Master Ju himself had Golden Core Cultivation and was one of Taiqing Sect's "Three Masters", a status only second to the Taiqing Sect's head.
With such a high-profile figure attending the auction, who would dare to compete with him? Even if the Huang Fu Clan's patriarch were present and saw Master Ju make a bid, they wouldn't possibly raise their own.
In fact, in this realm, once a Master gets involved in an auction, it generally signifies a resolute intention to win the item, and in most cases, for a Master to attend an auction is somewhat beneath their dignity.
Which Master doesn't have several followers who are Innate Experts at their disposal to do the running?