Nyet is right. There were no wild cost fluctuations on my ads until I made a very minor change on Feb 2nd. My cost went up by a factor of 4 just by removing an errant character in the ad. That's rediculous. Not knowing what was going on, I thought I had to further refine my ads. That only made things worse since costs were constantly fighting me. Imagine for a year you're paying "x" dollars per month, then suddenly you have to start paying 4 times that just because G makes a change to the rules without telling you. All last year I was able to make changes without worries. Now I'm afraid to touch anything (until some one points to a solution anyway).