No Floyd is the biggest name in the US. Pacquiao is far bigger when you look from a global perspective.
Floyd is the bigger name in boxing. Pacquiao is catching up though. Remember that he only started to be known mainstream after the Hoya fight.
World wide, the biggest name is Pacquiao hell the fact I know how to spell such a foreign name tells you all you need to know. And as far a this impacting on the purse of this fight it should. People don't want this fight because Pac is in it, or because Mayweather is in it, they want the fight because they are BOTH in it. It's an event that takes two parties to pull off, and so the purse should reflect that this is a joint effort and be split 50-50. This is both logical and simple.
So you don't think that the fighter who attracts more fans should get more money? Mayweather's numbers speak for themselves...