The cutoff for food to be considered raw (from the point of view of raw foodists, anyways) is around 115 degrees, and crock pots definitely go higher than that, even on low. However, if your primary goal was saving on power bills, it would probably do that.

I expect you would like some raw food, and not others, and it certainly doesn't have to be an all or nothing thing, except that some food probably tastes better to people who aren't accustomed to the taste of processed/cooked food.