Well I can't believe that I have to feed a year old ball python week old pinky rats LOL. He did list the weights and I thought for sure that they were just not updated. Not sure why they don't feed at least once a week and update their weights. Most of the time when I'm looking for snakes that are a year or two old I want to use them as breeders, so I would almost pay 50% more for a male that weighs 800 grams and is ready to breed vs. a male that is still hatchling size at the same age.
And females too, just look on Morphmarket, almost all of the older females are gone because people want the weight on them to breed them. I bet that breeder would actually make more money feeding them well and updating weights (and increasing prices to match). The cost of the rodents would be much less than the price increase they could put on the snakes. I've seen hatchling females of some morphs sell for $1,000 while that same morph female at 2500 grams could fetch as much as $4,000!