ember - 3:50 pm on Apr 5, 2013 (gmt 0)
Its not as simple as "you agreed to it" when you are effectively coerced due to no other real options in a market dominated by a monopoly.
Go find your own advertisers! Put together an advertising page/packet and approach potential advertisers in your niche. Offer them a deal which is a little more than what you are currently paid per click. You make a little more to compensate for your time, and they pay less than through Adwords because the middle man is gone. Many advertisers will not bother with you, but some will because many advertisers hate Adwords.