I played Colorado College on season and kind of wish I'd have kept it.
Still, it does have its drawbacks.
As someone already said, If the Rocky Mountain Athletic Conference at D2 has a number of good coaches, they'll keep you from pulldowns and even some higher level D3 players.
If the RMAC is rather empty of human coaches, you'll also encounter other D2 schools from a bit farther away challenging you on occasion. Colorado often generates some good recruits for D2 and if there are few or no humans in that conference, its open season for some from farther away.
Also, while recruiting in Colorado and nearby won't see much D3 competition, that's your ONLY area where that will be the case (assuming no one from D2 gets you as described above).
Still, it's an interesting situation, and it's no surprise there are no Colorado College openings available.