The amount they mutually agree upon. The employee wouldn't agree to work indefinitely for no pay.
The high compensation of successful founders is actually one of the things keeping salaries up, because any of the salaried employees has the option to quit and found their own company. The existing company has to pay well enough to compete with that -- because if what they're paying wasn't actually competitive with that alternative given the relative risk between them, why would anybody accept the salary?
2) It is possible for both to be true at the same time, because the industry is much larger than Apple, Google, Intel and Adobe. Even if they didn't compete with each other, they still have to outbid Facebook, Microsoft, Amazon, etc. -- and pay enough to prevent the workers leaving to found their own companies. It's not unreasonable to expect that the effect on wages was marginal even when it was occurring.
Incorrect, that value is only sustained and increased by the efforts of company workers.
> Employer competes with other employers for both a)market share b) hiring employees -bidding up their prices.
Incorrect. Companies that don't have significant oversight in the form of government regulation or strong unions tend to collude to keep salaries low - which is exactly what has happened in the valley, and has meant that these companies have gigantic cash reserves that they aren't leveraging to hire the best talent.
> By comparing gains from entrepreneurship with regular salaries, you are comparing a stock variable with a flow variable.
No, I'm merely saying that the differences and risks suffered by investors and founders versus regular salaried employees are not a justification for the sometimes ridiculous difference between the compensation of the two.