Quote from m22au:
I think I understand what you're saying - and you're right that currencies other than Bitcoin don't fluctuate as much.
Maybe a better way to think about it is this:
Let's assume that in the year 2024 there is a chance that Bitcoin is used in x% or more of worldwide transactions by value.
Let's assume that the value of Bitcoin in US Dollars, (assuming that the CPI has increased at an average annual rate of 2%) is given by the function BTC (in USD) = x/100 * 1,000,000
If you think that Bitcoin is a crazy fad / bubble, then it's worth something close to zero, and a strong sell.
If you think that Bitcoin is used in more than 99% of transactions, it's worth close to a million USD, and a screaming buy at $600.
It's similar to many disruptive growth stocks, especially biotechs - it could worth a huge amount, or it could be worth very little.