My theory: many refs are former wrestlers who once cut a lot of weight. When they stopped wrestling, they never stopped eating. Oh, and it was delightful for a while ... until the extra pounds arrived as the metabolism slowed.
The problem with this theory: most of the refs don't look like former wrestlers.
Hence the need for a new theory:
New theory: many of the refs wanted to be wrestlers earlier in life. They showed up to a few practices. They didn't like the demanding work ethic and/or the need to "take home" the sport, which meant among other things, to live on a healthy and at times strict diet outside of practice. So, in their later years, they became part time refs to relive their non-glory years as non-wrestlers.
The problem with this theory: I have no empirical evidence for it; just a hunch. But WKN (Wrestleknownothing) might be able to find some statistical support for or against it. He's a crafty man.
It's time to interview a few referees and get to the bottom of this 100 pound mystery. FLO, Intermat, Baschamania ... are you game?