Mr McBalls: Less than $0.05 for sure. When they run out of cash and are unable to find a fresh batch of investors, they'll just disappear.
To your specific comment: if you think the bottom is $0.30 to $0.50 then that also goes a long way to ensure they collapse to nothing. The only way they have lasted this long was by pumping the stock and raising money at substantial discounts. If the stock goes to the price level you are thinking, investors will look at a chart and really worry that it's going to zero. It's easy for most companies to raise money when a stock price increases everyday, but nearly impossible when it's going down the drain.