What I was emphasizing in that first post was that an agent can not defy market forces. If prices are down and the market is a bear which is the case for most of Westchester homes for sale, then even the most stellar agent will NOT be able to get you a 2006 price in 2011. The notion that the "right agent" will get the seller "their price" is a fallacy which dies a slow hard death for many sellers.
One agent is as good as another, so if one doesn't "perform" then we just move on to the next. Commoditization of the work force seems to be the order of the day - so it is somewhat natural that buyers and sellers would treat real estate agents the same way.