Why doesn't mayweather consider going out with the greatest bang in boxing history?

Mayweather can go out with possibly the biggest paycheck of his entire career by marketing his 50-0 fight. People all over the world hate Mayweather. This is no secret. People want to see him lose so bad. He has truly got under peoples skin with his antics and he has done it so beautifully, so why doesn't he go out with a bang? 50-0 would be a hell of a record and speaks a lot louder than 49-0. So hear me out. After he wins his 49th fight, he should fight one last time and set up a match with some virtually unknown white boxer that is hungry, has a decent record, is very family oriented and media friendly. Basically the exact opposite of mayweather that the public will come to love and adore hoping he knocks him out. Someone that is white as American pie and here's the brilliant part. He should schedule the fight on Christmas or New years eve! :) There would be so many drunks tuning into that fight hoping the great white hope knocks mayweathers block off, but in the end, mayweather ends up winning and depression sets in for the countless millions of people that put all their faith in the hands of the white fighter. That would bring in sooooooo much money!