Green_Grass - 4:46 pm on Jun 3, 2010 (gmt 0)
It is easy to say that adWords can substitute for free traffic..
BUT the barriers to entry on the Google adwords side are massive. Not the money..
The QS thingy is very difficult to tame and many an experienced adword player has seen what can happen when big G closes an account ( permanently) or puts a manual QS 1 on all keywords because their QS review teams working in isolation on predetermined parameters ( with little or no consistency) decides they don't like the site ( structure, looks , product or whatever).
I know this is a different topic for discussion but combine it with what they are doing on the organic side..and things get very very monopolistic.