In the past thirty days, judging by the volume and a conservative fee schedule, Mt. Gox has absorbed 69k$ in exchange fees. Now, let's assume these folks are incredibly reckless, and every month they blow 10% of their money on exchange fees. This would mean that they have at least 690k$ that they're playing around with in the market. And here's the thing: I'm pretty sure that number would be the same whether we're trading at 5$ or 5c. It's the amount of USD they have to experiment with Bitcoin. That's inelastic - what's elastic is the number of BTC to which that amount translates.
Now, there are about 8.5 million Bitcoins in existence right now. As everyone knows, a lot of that money is hidden or lost and hasn't moved in months. But let's assume that they're all actually in circulation, all theoretically available to buy.
If that optimistic assumption about the BTC in circulation is true, along with all those incredibly pessimistic assumptions about the value being traded in BTC? Even then, we have a price of 690000/8500000 = eight cents per bitcoin. And if you add in all the other exchanges, plus all the other currencies, plus the BTC that's out of circulation, plus the commerce that's going on in BTC today, plus the fact that most people won't be blowing 10% of their profits on exchange fees... that price has nowhere to go but up.
So five cents isn't a rational price. In fact, it's a darn near impossible price.
I have to say... I'm impressed with the way you think. Keep it up.