10% of a software engineer salary is a lot of money. That's just ridiculous.

Like the other commentor said, its just going to be a net negative, because whatever productivity increase you supposedly do get, you will see exactly 0 of that translated into salary increase.

I think you're off by a few orders of magnitude on cost.

People generally don't have 10% of their income to just give away on a whim.

Additionally, if I'm 10% more productive I don't get a 10% pay increase.