It's against Blizzard's TOS to sell Gold for real money and will get you banned if you get caught doing it. Not to mention that there are a lot of "Power leveling" / "Gold famring" services that are nothing but scams. They take your money, rip-off your account, and make you cry.
Thanks for the imput, we also have a long running thread in General Mayhem where the subscribers report the inappropriate ads that are being run. It's our ad filter of sorts....they are then removed from the loop