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I would think alot but then apple is really strict with their employees. I use to to work there and certain things were just not done because of the fear of being fired. Of course this depends on the manager but I think they would have something against their own employees having jb phones when they take such great measures to stop the jailbreak community. That being said mine was jailbroke and I was sure to not let anyone see.

The last time that I went into an Apple store, several of the employees had jailbroken phones and weren't afraid to show them off! Their manager must not care because they were pretty proud of them. LOL
 
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