So basically, when yahoo and all the rest get on the band wagon the pay-per-click market will turn into a commodity and the prices will average out.
If google is adding 2000 publishers a week which will in turn convert more and more websites to adwords, and then yahoo starts! Yes, it just doesn't seem like it will be long before it grows tiresome trying to seperate text ads from text content on peoples pages. Burnout seems inevitable.
I'm just going to wait and see. Thanks for the replies everybody.