Heh. Sure, we all want lower fees. BitFloor makes substantially less per transaction. It's their choice.
The amount made per transaction is independent of the principle of paying the liquidity provider. Mt.Gox make 0.65% * 2 per transaction. That can be split anywhere they like, and the percentage to provider can be anything they like. For example if the liquidity provider is paid 0.5%, then the liquidity taker has to pay that 0.5% plus the 1.3% trade fee = 1.8%. I'm not saying that would be good; but it's to demonstrate that paying the provider is a separate issue.
I know. But I'm talking about the numbers quoted above, not about the principle. The principle is basically the same between Bitfloor and Intersango now, but Bitfloor takes a much lesser fee and balances it more towards the liquidity provider.