That idea is pretty awesome, but why limit employee compensation in such an unflexible way?

The idea is to empower worldwide collaborative software development.

People get too hung up on what other employees are being paid, which is used as the benchmark for the valuation of their contribution to the project.

This tension blows projects apart, and explains why there are no prior GPL based business models (either the code is contributed gratis by individual contributors, or a non GPL based corporation releases code in support of their primary revenue stream in the sale of services, consulting, ustome development, sale of hardware).

By focusing on reasonable expenses, this levels the global playing field, and disables the compensation friction.

In the end, it is the consumer which must feel satisfied, that they are getting value for money spent. And it should therefore be left to the consumer to decide which persons to award higher compensation in a bonus.

I don't think this will work. This is not how it works in any of the open source based companies I know, and I know a few.