Don Tepper -
In the SF Bay Area, it is relatively common to see commission rates differ for transactions of different size - smaller properties or bare land typically have a higher commission rate, while higher-end properties - say > $1M or so - typically have a slightly lower commission rate.
I ran an analysis using historical MLS data regarding commission rates for homes in the $750-$1M range; I didn't see any correlation between higher/lower commission rate and the time on market or the delta between asking price and selling price, so my conclusion is that a relatively small adjustment in the commission rate (.5 % is typical here) doesn't have a significant impact on the behavior of buyer's agents.
I'm not a statistician, YMMV, and all of that - but I found it interesting (and a little surprising).
Ultimately, for better or for worse, commissions are typically negotiated and paid outside of the relationship between the buyer and the buyer's agent so it's tough for buyers to get a lot of information about them, or to have a lot of leverage to change commissions. - Fri Aug 29 2008, 02:17