[WotaWaster]

I would be more concerned if I was one of his stakes.
If he has 50% of a guy's action, he can force them into terrible spots with very marginal hands.
He basically only need 26% equity in a preflop all in as opposed to 51% since if he loses a full buy in half of it is coming back to him anyway.
When there is already dead money in the pot this allows him to play even hands as weak as bottom pair very aggresively against his stakes if he gives himself any fold equity at all. Even if called by top pair he likely has the correct odds to draw to 2 pairs knowing half his losses come back to him.

This can impact the rst of you if you are in 3 way pots since if the staker can in any way force you out of the pot when you have a strong draw/semi strong hand and take the worst of it against his stakee with your dead money in the pot he is making a +EV move.

In short if the money meant anything to me and the game was anything other than a drunken home game with a mate bunging someone a few quid so he can get a game I wouldn't be comfortable playing.