Think quite a few folks have been using those or some iteration for years now, someone realized many guys would pay just to have it handy and pre-made, plus the homeowner market that buys from them as well is likely a good source of added revenue stream.
Just fyi, everyone knows CC owns that sales place right? Not saying you shouldn't buy from them, have at it, but be aware you are buying from the national franchise. At least the last time I checked.