Its a bit of a scam except with the little guys say 112 to 118 and is one of boxings dirty little secrets. Going from 8 divisions to 17 had a reverse effect then intended. Now you have people fighting one or two divisions south of their proper weight class because of the way weights are managed. I dont know if you remember Morales at 122 but he quite literally looked like grim death at the weigh in. Come fight night he was a full fledged lightweight. The 7 pound difference is more marketing today. I mean just look at all the belts and sanctioning fees.