I think that the most common way to value Bitcoin is like valuing other currency by another currency.
Seeing to it that we all know all the factors that causes or affects supply and demand equilibrium.
Also the time we hold bitcoins. Time is very important factor.
I value bitcoin like what Im importance my currency in my country.Like what we value in our currency same like in bitcoin because the indemand price of it increases and decreases of currency depending on the flactuation of bitcoin.It is very important to because bitcoin gave me a source of income and a job so that I value bitcoin as our currency.