Even beyond SOPA , I’d leave because of this: http://www.huffingtonpost.com/2011/03/31/bob-parsons-godaddy-ceo-elephant-hunt_n_843121.html
The idea of splitting commissions has come up a lot in the last couple years. In all honesty, it always comes down to the fact that it would only appeal to a niche audience. There are usually more vital things to work on.
...But I must agree that it would be a nice feature to have!