Hey there,
i would suggest a reporting system or any other easy way to report those bots and sellers.
The first thing i see when logging in is something like:
SELL CHEAP SILVER -> www.mmotank.com for example.
Here i will explicitly state three of them.
Char/Team: SerNevermind
Website: www.mmotank.com
Char/Team: Angelina
Website: www.goldceo.com
Char/Team: Orhaa
Website: www.seagm.com
Greetz