Around here they do. It's all part of the getting lean and mean thing. It seems like there are two types of Crossfitters. The ones that go to Crossfit to suppliment other training they are doing. They seem to not get sucked in to Crossfit as much, they use it as a gym and eat the way they feel they need to for their sport etc. Then there are the Crossfitters that have Crossfit as their primary mode of exercise. They seem to not do much cardio and are embrace some of the more cult-like aspects of Crossfit. I don't like to put it that way, but I can't think of any other way to get the idea across. They buy into everything that Crossfit preaches including diet.
Don't get me wrong, I still think that Crossfit has it's place and most of what they preach in terms of diet etc is pretty good for most people. What I have a problem with is that they seem to think that there is one right answer for everyone and they are kind of pushy about it, it seems to me anyway.
Living life like there's no tomorrow.
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2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS