IF they are doing this as a living, dont they want the highest efficiency of the snakes? So overweight or obese males and females do not breed well, correct? Also shaving a year off of waiting for breeding size could very well shave 2 or 3 years off of its breeding life span. So wouldnt that be counterintuitive? That wouldn't be very efficient for business.
I dont believe powerfeeding your snakes is part of the business at all. Most breeders wont powerfeed because though they are making a living, they still care for their animals.