Could not find anything when I Googled about How Big Affiliate Marketing Industry is and so would love to get some numbers like growth numbers in 2011, 2010, and past and how is the future of this industry shaping up.

I see every ad network allows affiliate marketeers but when they outgrow affiliates, they just kick them out. It happened with Adwords, It happened with Facebook and soon it will happen with Bing may be.