It would work like any other exchange except the necessary fee would only come after you withdraw your money from the exchange, say a flat 5%.

Whether you buy or sell, you will not have to worry about the fee or tobin tax in your trade. If you sell high and buy low with even a satoshi of difference, that profit will be right in your account. You will only have to consider how much profit you will need to cover your expense when you withdraw.

What if you deposit money, don't trade and back out? That's fine. No fee will be deducted unless you make a single trade.

Thoughts?

This exchange would be suited for speculators and not somebody who just wants to sell or buy BTC.

Here's the dream behind this: Imagine being able to trade 1 BTC up to 10 BTC with no restrictive fees stopping you along the way!