Is it an official website ? or some rogue site selling rules that can be downloaded for free from the main LnS site ? If it is the former, I would guess that someone has put a lot of time and effort into creating these customised rulesets, and simply want some recompense for their work & expertise Some people haven`t got the time, inclination or knowledge to create them manually, myself included
The only one I would trust and use is from Phant0m https://www.wilderssecurity.com/showpost.php?p=1663006&postcount=7 because he is very active in the LNS forums! TH