Well done Blizzard!
Apart from the annoying spam, exactly how do these companies raise the gold they sell?
Botting and hacked accounts come to mind. Two more things we can do without in our beautiful game.
Which reminds me, some these web sites where you can sign up for gold and power levelling services have been flagged as having malware that will try to silently install itself onto your pc if you visit them. Great going tossers! They sell you the gold then hack your account later and take it back. Bottom line is never go to any of these web sites even if you are curious.