Intersango is trying, but BitFloor has the right formula.
At Intersango liquidity takers PAY 0.95% and liquidity providers PAY 0.35%.
At BitFloor liquidity takers PAY 0.4% and liquidity providers RECEIVE 0.1%
I trade BTC/USD at Mt Gox, Crypto X Change, Intersango, CampBX and BitFloor. Each one has their advantages, but when it comes to commission structure, BitFloor has shown the way.
Heh. Sure, we all want lower fees. BitFloor makes substantially less per transaction. It's their choice.