The problem I see with that is that most hardware isn't necessarily usable only for mining. What do you think about "Computer hardware"?
That makes sense.
Also, if selling activity increases enough, maybe also consider separating digital goods from tangible ones.
Digital Goods (from the past several days):
-eGiftcards
-Steam Codes
-Game Keys
-Accounts
-Programs
Tangible Goods (from the past several days):
-Syrup
-Rare Metals
-Clothing
-Music Accessories
-Dog
I could volunteer several hours per week moderating that if that's alright with you.