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a) Overture is not a god, it will not grant you paying customers for $2.35 a click. Contrary to what anybody might say touting Overture's magic, paying customers my friend, is entirely on your end.
b) Overture is not the best ppc in the world, it is the biggest, in fact the best can be determined by how it works for you. Some people make millions, and some...well some find other methods of advertising. Look at WMW, I know thousands of people visit this site everyday and I doubt Brett pays an awful lot for it...not because Overture sucks...no, because Overture is not necessary for sales, or visitors.
c) to sum this sloppy post up...Overture is not the answer, it's an alternative, a vehicle. It works for some, and doesn't work at all for others. Think of the reason you got into SEO, or your business. You took the time to research, learn and apply yourself. How you spend your money advertising on or offline is incredibly important to surviving, there is no difference with Overture or any other ppc for that matter. Choose your keywords, stick with them...and for gods sake people have something worthwhile on the other end of that click.