Taking advantage of the ill or someone going through a rough patch is wrong. I think most will agree with that.Great thinking. Now start looking for people with serious medical conditions of going thru a divorce and lowball the crap out of them; go lower than pawn values, after all you are a business man. Scruples are for others, you are just " helping them out" when they need some cash.
Listing a bump Stock at $500 and immediately selling it = two happy traders with no injured parties.
Listing a bumpstock at $1000 and no one buying = no injured parties, just a little wasted bandwidth.