I have not personally worked in an Apple Store, but know three people who have. Two were regular floor employees (I don't know Apple's official title), one was a Lead Genius in a large "flagship" store. Their comments on the experience were all basically aligned: It's a bit like really liking pizza, so you decide to go work in a pizza restaurant. Eventually, you start to really hate pizza, and you're still working in a restaurant. Put another way: yeah, it's the Apple Store, for what that's worth, but you work in a mall in a very public-facing job for a very middling wage.
All three are people I would say are well aligned to the concept of helping others. They liked the opportunity to solve problems, and had the right personality to weather the general culture of rudeness and entitlement that people who work in retail environments are subject to daily. The Apple Store is no different in that regard—people are just so rude. You have to have a very thick skin.
Two worked there for under two years. One for 4 years (the lead Genius). It's not a place people tend to stay at very long.