Gold Farming

So this little quest of mine starts out with me being one broke son of a bitch, with most businesses out there not really wanting to hire new employees. So with the lack of traditional jobs available I've been looking into finding something online to make money with, one thing is the digital photography school tho I'm not a very good photographer by professional standards, and i haven't been able to get out much to take photos it might work in the long run, but the long run doesn't help me get to ama this year or get a cosplay together. So when my girlfriend told me that she just sold some gold on gaia to buy a clear nose stud i started looking into goldfarming and an interesting thought came to mind. Why don't mmo's make goldfarming official and not illegal? Think about it lets say blizard made an official site for WOW goldfarmers and required that the goldfarmers paid blizard say about 20-30% of each sale they could make even more money then they already are, and we all know blizard has turned greedy enough to do it too. My point being that its nonsence for mmo's to not do this, especially free ones run by small software corporations, these small corporations could get allot bigger allot faster and make a better quality game instead of using the same monster over and over again just a differnt color or size. Just another random thought....