with a profit margin at 70%, they can afford very high pay.
And the equity holders would get diluted a bit when new employees are offered equity, but looking at the rate of profitability, each new employee more than earn their share in equity, even at the high end. Therefore, it is in fact, in the existing equity holder's interest to get diluted a bit to hire these employees, who would produce way more value (and thus increase the total value) compared to the loss in dilution!