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I don't think the recycling of salaries is an issue, so long as the salaries are at fair market values. The fact that employees of EOS are using their salary to buy shares is no different from Joe Blow using his salary from his job at the pizza shop to buy shares, in my opinion.

Where issues of ethics and fairness arise would be if employees are in possession of privileged confidential market sensitive information (for example, development progress) that is not open to the market and are buying shares. Publicly traded companies generally have strict rules on employee trading to avoid running foul of insider trading rules (generally limited trading windows a certain time after price sensitive announcements have been made).

How could the problem of insider trading be solved with decentralised organisations?