^^You misunderstood me. The supply/demand chart simply doesn't apply when you're buying money with money. The more a dollar is worth, the more you want it.
Let's say there's an imaginary coin called Bitcoin. See fig. 1 below.
http://pre05.deviantart.net/cb2d/th/pre/i/2013/076/5/7/ten_bit_coin___royal_equestrian_mint_by_tidalkraken-d5ydcl1.jpg Fig. 1
1. Let's further say that there's a queen, we'll call her Satolestia, who is totally trustworthy and buys and sells those coins for exactly 1 US dollar. She promises to buy all the coins we have to sell, forever, and we trust her, because she's a queen and also an imaginary one, the kind that doesn't lie.
If we're bored enough, we'd buy and sell those coins from/to Satolestia day in and day out. Pretty pointless, but hey...
2. ...until Satolestia changes the terms: she starts charging a penny more, but still pays a dollar when we sell her a coin.
Wat do?
Obviously, the dumb thing to do would be to keep buying, and losing a penny a coin. But we're in it for PROFIT, so we stop buying altogether. Not just some of us, not slow down our buying, but both of us. Stop buying. Because buying shit for $1.01 and selling it for a penny less is an excellent way to go broke.
Which we don't wanna do.
3. Conversely, if Satolestia starts charging us 99 cents per coin, while still paying a dollar, we'd be on that shit like white on rice -- we'd go into a frenzy, buying a coin and selling it right back to Satolestia at a profit, rinse, repeat, until we're satiated.
You see where I'm going with this?
It doesn't matter to us how many dollars or how many Bit coins there are, the only thing we need is the price, and knowing what someone will pay for our coin. This is an imaginary thing, we know exactly what Satolestia will pay (because she told us & does not lie), so the problem is trivial: If Bitcoin price is < a dollar, buy; If => dollar, don't.
The fun part -- and what makes purely speculative assets fun, is that there is no Satolestia. We have to guess what people will be willing to pay. We might convince them that our Bit coins are worth more than a dollar because there's a limited number, but you and I know that's just a pitch, a nice backstory, a coldblooded thing to say to a motherfucker before you put a cap in his ass.
Other than "too many words," do you see what I'm saying?