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Trust me, assuming you are a bull, you should be hoping for tons of naked shorts. The more the better. They borrow bitcoins / ETF bitcoins (in a best-case-scenrio, from you), and start dumping them. You let the market depth eat up his asks and let the price go down. Now you wait until the short is about to expire, re-buy at the lower price, the more the better, causing increase in price. Sooner or later the first of those shorters take profit, buying back more bitcoins than they borrowed to pay you back with interest, but these first dudes walk away with a fair profit. You time your own buy just before the first shorts are about to expire, now the price is going up and the shorters owe you coins, and you just bought bitcoins at a discounted price, and due to margin calls & interest, the whole deal is actually liable to INCREASE the bitcoin price.
There's a reason why naked shorting is a bad practice, its because its incredibly risky, and if too many people do it, then it essentially forms an inverse bubble except worse, since there is the potential to lose MORE than you originally invested. And when the bears take a big risk, and that risk fails, they lose money, and when the bears lose money, the bulls win.
Too much naked shorting can cause all sorts of problems for a commodity, but a declining price (at least in the long term) is not one of them.
Yeah, okay, you can profit from other peoples' naked shorts. But the idea that it will increase the value of the asset assumes that the person shorting naked will
actually cover their position someday.
Lemme explain.
You have your BTC ETF. There's one million shares of it. I naked-short-sell 5,000 shares. Three days later I cover my position by buying 5,000 shares, and immediately naked-short another 5,000. Less exchange fees, my position hasn't changed - it was -5000 (naked) shares yesterday, and I bought 5000 and sold 5000, leaving -5000 (naked) shares today.
The result is that, as long as I keep this up, at any given time there are 1,005,000 shares of the ETF on the market - 1,000,000 "real" shares, and 5,000 created by my perpetually renewed naked short position. Which means that to the extent that market considers these ETF shares to be equivalent to holding BTC, I've effectively
inflated the supply of BTC.
That's the attack I'm proposing, and why I think that even though the Winklevosses can't really cheat, this bitcoin paper can still exist at over-unity to the actual specie.