Pondering potential trade-ins

When buying a new Mac, you can have only one trade-in. I plan to return my M2 MacBook Air which offers a greater trade-in value than my Mac mini. I’ll either try to sell the latter myself or keep it, in last resort, to act as some home server. Keyboard wear is easy to notice by a potential buyer but Apple doesn’t seem to care too much. But Mac minis are a harder sell, so there is that.