Just started to give Google AdWords a go.
I have gone through at least a hundred different variotions of key words in an effort to find the ones that Google says are fairly well searched, and at the same time a little cheaper than the many .70 to 1.50 PPC range.
It took a couple days, but after narrowing the 100 down and bidding on those that let me be at least "elibable" to be indexed in the .10 to .30 PPC range, have about 10 that are Google AdWords is posting..
One thing I noticed.. Although I deleted many, I kept several that required a PPC cost over what I was willing to pay.. I kept quite a few in the .40 to .70 PPC range.
I noticed that by being patient, and keeping them in my list, after several hours, AdWords reduced the amounts down to my .30 price range so I could become "elibable" to have them indexed.
I think they tend to feel us out at a higher PPC. If we don't bite, then sometimes if we are patient, they lower the price a bit...
Can't explain it, but did notice it ....