If we only talk about wages, considering Feng Qingxue and her family's extravagant spending habits, it's really not enough for them to get into collecting, which is indeed an expensive hobby. But they have gold in their hands, and a large amount of Lu Family's assets belong to their branch. Moreover, with the help of the metal detector, Feng Qingxue and Lu Jiang have also acquired quite a bit of gold and silver.
Gold in troubled times, antiques in prosperous times.
Although future gold prices will be incomparable to now, rising to several hundred yuan per gram in decades, it still won't match the immense profits of antiques. When they run out of money to buy antiques, they directly sell gold, since gold doesn't have much cultural value if kept.
However, there aren't many valuable antiques in the waste recycling station.