Google Diablo 3 gold or Diablo 3 gold farmers for example, you will find
About 25,700,000 results (0.20 seconds) for Diablo 3 gold
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I can go on and on blizzard ... my point is you say you do not support hacks and gold farming ... but yet I just googled something and showed you how many sites are breaking ur rules.
What are you going to do about it ... Ban these accounts who give 50m gold or more. Make a button to report these gold farmers. So that people in Blizzard can investigate. Then the RMAH gold will make you more money. Gold farming should only be "Bought through Blizzard" simply because you are allowing people to sell gold on your site for real money. For these gold farming sites ... ban them all for selling online. Change your rules saying if you are caught selling gold online your account will be banned.