I'm curious why $100 is to much for an OS that will be supported for years to come? Especially when many games, with a season pass, will cost more than that, and will likely be supported for a much shorter period of time.
This has always been the biggest disconnect with people who build their own machines. Sure they'll pony up $500 for a video cards and $400 for a CPU, but the cost of the operating system that lets them make use of everything for the next 2-3 years is seemingly always too expensive.