@starsoccer9 forgive me if you thought I was expressing sympathy for MtGox.  I personally highly dislike their % based fee structure.  A flat rate would be much more effective, especially for traders.  It would be even better if we were given the choice on what fee structure to choose from (assuming they do one day implement a flat rate).

On your other point - no one is telling you what you should do with your money as long as it doesn't negatively affect others.

But to be rational, bitcoin is not really ready for REAL day trading - yet.  Unless you are day trading bitcoin with a VERY SMALL sum of money, you can't expect a stable fill price.  If I wanted to use $100,000 to day trade bitcoin I would have to be willing to stomach 3% slippage in price to get my order filled, excluding MtGox commissions.  And given how MtGox handles partial orders and cancelling live orders I really doubt you would want to be in this situation.  To add, MtGox deliberately charges a large comission (0.25% ATLEAST) - that is $250 on 100k.  My stock broker charges me less than 2% of that fee no matter if I trade $100 worth of stock, or $1000000 worth of stock.

The systems aren't in place for effective day trading.  You're WAY better off trading the U.S. stock market if you want to day trade.