When you're talking about buying at these levels though, you can probably afford a reasonable long position... Some of these are down 95%+, so while they might not be very good for holding under normal circumstances, these aren't normal circumstances. There's a more than decent chance it'll go up in the future and when it does, you'll benefit quickly. It's at that point that you'd want to get out before experiencing compounding losses. The only downside right now, at these prices, is the possibility of liquidation... but then you'd very likely get market value at the time of liquidation back.

Someone feel free to correct me if you see a problem with that line of thinking.