The value of a money manager at a hedge fund is easier to objectively and fairly measure than the value of a startup.

Even if an Internet behemoth like Google paid engineers large sums for their successful 'internal startups', I don't see how they'd come up with the same value as a competitive acquisition process with the startup retaining the option to walk away and carry on independently. Entrepreneurs would still leave in order to avoid being subject to the whims of the one and only one potential 'acquirer'.