No way a Pacquiao-Mayweather fight happens anywhere but Vegas. The site fee that the MGM Grand will put up alone will stop anyone else outbidding them. The reason being that the hotel can accomodate a high-roller's fight ticket safe in the knowledge that some of those guys will drop up to anything up to $1m at the tables over the weekend. Take a few of those guys, plus all the other money spent by fans at the bar & it's a no-brainer for them especially on a fight this big.