Shopping malls usually play a gimmick. For example, if your old home appliance is a TV, will the mall say that your old TV will give you a discount of 300? You can never sell it to someone who collects old appliances. In fact, when shopping malls sell to old home appliance dealers, they can only sell for 80- 100, and the other part can also be given to you by shopping malls, or the joint manufacturers can give you some resources to recognize this profit. That is to say, even if you don't use old TVs and shopping malls, you can also give you preferential treatment in 200 yuan.
I wonder if I can answer your question.