Let's say I'm a competitor, and I find that Niel (randomly picked) is someone I want to hire. All else being equal, I offer him $100k (website says he's making $88k). He comes to his boss to say "I like it here, can you match it?" What does his boss do? Especially, if he's valuable to the company... What if I have a very specialized skill that doesn't fit nicely into your matrix? Let's say market pay for my skill is…
I've no particular confidence this would work well, but it seems a consistent approach that has some potential.