methink this article explains better why pac's team doesn't want to do it:

Pacquiao vs. Mayweather: Floyd Mayweather Jr. Attempts to Kill Boxing | Bleacher Report\\

"Mayweather is once again willing to negotiate, as you can see in the article I’ve linked below. Other articles have made the point that it’s not the blood testing that bothers Pacquiao per say; it’s the relinquishing of control to Mayweather."