There's a potential risk for you however. If there's a panic buy-back demand with a high volume, you will lose a lot of money when you liquidate your position, considering the low liquidity of GLBSE.
This is a really good point. I plan to buy-back the shares with my own money though anyway if people want to sell to avoid panic liquidation. I'll try to keep a sizable personal reserve for this purpose, but naturally I don't have an infinite reserve for a real GLBSE catastrophe, such as a major crash event.
I'm hoping that liquidity improves as time goes on and therefore withdrawals will be less of a problem.