I agree with Mark Bailey on this topic. I have "power-feed" important males. By that, I mean fed every three days as opposed to five days for hatchling. I did this to get them up to breeding size at 5 or 6 months old. If I thought that it would hurt them then I would not have done so. I have also offered a second meal to females that I am trying to gain some weight before breeding season. I also do not feel that this hurts them in any way. In my opinion, if they do not want to eat then they won't.
I do not understand where people get the idea that power-feeding will shorten their life span. I do not think that any of us has been in this hobby long enough to come to that conclusion. Ball pythons can live to be 50+ years old. Does anyone know of any accounts of ball pythons that have died due to power-feeding? I don't.
I understand how people that think that power-feeding is detrimental to ball python's health would think that someone that power feeds is just in it for the money, but I disagree. I do not think that power-feeding hurts the snakes. If a ball python does not want to eat, then it will not. If it does, then it will. If someone wants a female to gain a few hundred grams by breeding season by feeding her every five days, then I do not see the problem.