Not me. I am my own mechanic, and my LBS provided me with the hardcopy and e-copy (.xls) of my Serrota Fit data so I can use it in any of my future builds. If I want new handlebars, I'll put them on in my shop.* My LBS mechanics love the fact that I buy parts and don't need them installed; I'm sure they get their fill of work with all the shop tickets I see lined up in the bin.
As for cleanup, I've seen people bring their mountain bikes in fresh off the trail and dropping muck from the front door to the service desk.
*OK, "shop" is stretching the definition. It's 1/3 of the spare bedroom we use for a computer room.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.