[TheWorstPlayer]

soah is right, of course. if you staked him for 2/4, then anything he plays other than 2/4 is out of his own pocket. however, if you staked him for 2/4 you sure as hell should be clear as hell that he is being staked for 2/4 and ONLY 2/4 and don't muddy the water by talking about maybe moving up at some point when he accomplishes some thing or whatever. how obvious is it in hindsight that you should have emailed him saying "amount of stake: 4k, stakes to be played: 2/4, amount of time: 1 month or until ended by KingDan, sites to be played: PokerStars, UB, FullTilt" etc etc....

takes one second, protects your 4k investment...

edit: AS I SAID INITIALLY, looks like he owes you the money. AND looks like you were an idiot. I don't see what you disagree with here... you were by your own admission not clear enough...