Such a maker/taker fee is similar to what Intersango has been doing - the fee three times higher if you take an offer in the order book instead of making a new one.  Bitfloor went even further and made the fee for market makers negative.

I must say I don't like the clearing fee of BUK3, even though it is small.  I hope that will not be a pattern for future use.

And a final comment:  The leverage is getting a bit low.  I know that is part of a strategy of reducing counterparty risk, but the only way of eliminating that is removing leverage altogether, and that would make ICBIT uninteresting.  We are unfortunately moving in that direction.  I would rather have a slightly larger counterparty risk, and then be able to trade at 1:4 or 1:5.  I think that the combination of high fees and low leverage hurts the volume at icbit!