Interesting thought. Now let me explain why that will never happen!
Every single employer values the top 1% differently. Take permanent Ruby Developers for example, I know of a company who's valuation for the top 1% is absolutely spot on. I know of another company in the same area that values the top 1% at about £10k less per annum. The point is, they both genuinely understand what the skill level and experience level of said 1% is, they just significantly disagree on the value of said 1%.