There are always circumstances. You don't really become a star till you fight Oscar so comparing the numbers on JMM-Pac and JMM-Floyd is kind of silly, one fought him after he fought Oscar and the other didn't. The fact that Pacquaio fought ODLH after Floyd beat him and Hatton after Floyd beat him probably affected the numbers somewhat (along with the economy)

And here Cotto is a bigger draw than JMM, its just a question of how much bigger? There are only two real draws in boxing, Floyd and Manny, Cotto is in the second tier if there is one.