No, I think you're misunderstanding me. I'm not using the spot price. I'm using the values that people are actually selling for. If you put in a sell order with a minimum price of something like $0.60, the orders would go through immediately, and you'd get $5600 in your Mt. Gox account. Once again, you've failed to actually fact check your post. The daily volume of Mt. Gox is routinely 10,000-15,000. Yes, you would bring the price down about $0.10 in a matter of minutes and possibly trigger a sell off, but that wouldn't make a difference to you if you just wanted your $5600.

EDIT: Here's the actual spreadsheet if you'd like to double check my work: https://spreadsheets.google.com/ccc?key=0AomGTgVWFh3WdDAxQ01...

Here's where I got the data on mygox: http://mtgox.com/trade/history