You do realise that you can redact the URL itself and still give blizzard a tip about it on these forums? Then you won’t help the gold sellers by advertising their website.
Blizzard don’t really care about what is going on on these forums. Using the ingame report button, or sending a mail to hacks@blizzard.com would both have higher chance of getting Blizzard’s attention, but without the added downside of spreading the URL for the gold sellers.