There needs to be some fundamental analysis used to determine...

There needs to be some fundamental analysis used to determine what price we place on a company. At least at a minimum establish a revenue baseline, perhaps 3... optimistic, average and pessimistic, then adjust the PE accordingly.
UBER might seem irrational now, but down the track when automated vehicles make their mark not everyone is going to want to loan out their car as Elon has suggested.
Telsa does appear very irrational by way of their sales numbers, but then similar to UBER becomes about potential but also has a factor of achieving targets continuously along with little surprises that keeps everyone thinking of the possibilities. (amongst other things)
One of the things that I think bothers the rational thinkers that browse these forums is that of market caps and pricing being declared without any backing to the statement. It is for that reason that I asked the question....
@GCar what rationale would you place on Galaxy having a market cap of $5 billion?