There rollouts are also slower for a couple reasons:

- every In-N-Out must be within 500 miles of a beef distribution center [1]

- In-N-Out tries to buy it's land [2]

My impression is that they grow the business from cash flow, not debt, and they move slowly so they can keep up quality. They are a privately held company, so hard to verify some information.

[1] http://www.ocregister.com/articles/accelerates-291670-expans...

[2] http://www.innoutrealestate.com/

  They don't have franchises like the other chains. 

I don't think that's a factor. Both corporate-owned stores and franchisees use the same employee demographics, generally. Sometimes you'll find a franchisee who is an immigrant from outside the Americas and find a lot of family members and their friends making up the crew. (For example, there's a local Taco Bell that has more South-Asian employees than not.)

Do affluent teenagers care about benefits although when their parents very likely have benefits for them already?