It's almost an assumption that Capes of Accomplishment are responsible for OSRS Items a dramatic increase in RuneScape's 99s. Part of that might be due to the fact that there are more players now than there was in late 2006, but the majority of 99s are because people are looking for an ability cape.
Most people don't train to 99 because they love the skill. Many people who have a 99 have stated that they don't enjoy the higher levels. I've spoken to people about this. It's not necessary to work on it if you disapprove of it. It's just a fun game. It's not an opportunity to earn an eagle. While you might gain respect for your work, if you have 99 people that are 'buyable,' your popularity will plummet.
This brings me to my second point. A 99 is 99. Each requires time and effort, and some require more effort than others. What is the reason people are relegating the ability to do 99 things such as Fletching or cooking? In recent years, the ability to master 99 has become a necessity.
My view is that the skill cap has significantly improved the lives of individuals. People who weren't thinking twice about getting 99 skills last year are now eager to train, train, and train again until they reach the 99. RuneScape has a game. It is not a parasitic leech. games are meant to be enjoyed.
Your "Skiller Level" formula works much in the way as the Combat Level formula. It is important to Buy OSRS Fire Cape note that this formula is not an official formula. (Round up.)