Assumptions:
-- Let's say there's a 25% chance that bitcoin is $1500 ten years from today, and a 75% chance that it's $0.
-- Let's assume a discount-rate of 8% annually (roughly historical stock market return).
So, the Present Value of $1500 ten years from now at 8% annual discount rate = $694.79
Expected Value = (0.25)($694.79) + (0.75)($0) = $173.70
This is the wrong way of calculating things. The chance that Bitcoin will succeed must be calculated from the market price, not the other way around (unless you have access to insider information).