Can't someone just reply by pointing the "salesperson" to the sticky on selling stuff here? Or pointing out that we don't like people joining just to sell a product?
It's not like these ppl are totally naive, innocent kids that don't know what they're walking in to. They're deliberately targeting a forum/online community - with no real intention of ever participating in or contributing thereto - merely to drum up a few sales.
The forum's reaction is akin to a door-to-door salesman who ignores my "no soliciting" sign getting the door slammed in his face.