Bitcoin valuation 到底怎么算出来的？

我知道：

1） it takes lots of energy to get bitcoins. BUT bitcoins can't be transformed back to energy 

2) you can't print bitcoins. BUT you can create a similar crypto currency. You also can't just print gold, which is accepted by all countries over last 1000 years

3) there is no government can control bitcoins. But this also means it's not backed by any government credits and same applies to other cryptocurrencies 

4)  there is no real usage of bitcoins except for it's financial value, which mainly depends on how many people believe in it

5) there is a limited max number of bitcoins and in reality the number is get less and less over time due to accidental losses. in my mind, bitcoin can be anywhere between $1-$1 million.