It's not market inefficiency causing that, but rather expected value. If a company has $1bn in the bank and you expect them to squander it, then you'd be foolish to value them based off of it.

This same logic explains the value of Amazon; they plow profits back into the business, making the future business bigger and more valuable. Their shareholders clearly agree with that type of longer-term thinking and have rewarded Amazon's growth with giant valuations repeatedly over the years.