Why Isn't There a Tech Talent Transfer Market for Employees

I have been wondering if we could build a Tech Talent Transfer Market (TTTM) just like that of sports industry, where a company may buy a hot employee for hundreds of millions of dollars (or any currency)to their company, in this market any employee may enlist himself/herself as willing to transfer and companies may start bidding for the employee.The payment will be made to the employee's company. This are just my thoughts, state whatever you think about it or notify me of the existence of something like it.