Tell me who in his right mind would spend 500,000 away NOW just to fool around.
Think again, they weren't in a wallet, they were in MtGox.
I see it is simply a logical gap in your brain, unfortunately there are no patches for faulty brains.
The standard story so far is that the person that spent the 500,000 now just to fool around was not their legitimate owner.
I have no idea what you are referring to in your wallet comment. As far as I can tell, you think that I think that the coins were in a wallet, and the wallet was lost. Which is silly, because not long ago I was trying to explain to you and niemivh that wallets and mtgox accounts are totally different and unrelated concepts.