The thing is you have to sell it sooner or later or you won't make a profit. If you sell it to such a price that it's significantly lower than people expect it

The thing is you have to sell it sooner or later or you won't make a profit. If you sell it to such a price that it's significantly lower than people expect it to be, someone will buy it so they can be sold at a higher price later. It's extremely easy to open both short and long positions on BTC market, so the current price should remain close to its expected price.