Fair in the sense that both the buyer and "sellers" agree on the price.
howrar
As long as the price is fair, I don't see why this should be a problem. It sounds like it should be mathematically equivalent to purchasing a percentage of everyone's shares. So share value goes down because you've essentially "sold" some of it to someone else without changing the absolute number of shares you own.
The noise you add won't even register. No two people are going to half-ass it the same way, so if you average everyone's responses, the correct answer comes out.
Regarding #1, it can work the same way that company ownership works now (e.g. when you buy shares on the stock market). I don't know how they inject money when times get tough but I've certainly never given them anything.
Because it can do something that the alternatives can't do or because they refuse to use something more modern?
Sellers includes the employees. I put it in quotes because it isn't exactly the same as other buying and selling transactions where the sellers are actively part of the transaction.