It would get spammed or used against FR.
Oh look, a KKK robe for sale. See I told you they were a bunch of racists.
Perhaps as a side benefit available by subscription. I doubt many trolls would pony up even a dollar to do as you suggest if it would support efforts at FR. Also—maybe with a membership application/approval process?
You sell KKK robes?
You sell KKK robes?