Why is walmart a good 24 hour place to shop at?

7 AM on a non Saturday

they have overnight stockers that are there from 11PM to 7:30 AM, all the dept mgrs work 7-4, a lot of salaried mgrs work 7-5, and they have a good number of sales associates working 7-4. they also have a couple cashiers getting in at 7 usually, and the store is dead. Sunday mornings are beyond dead, but not as overstaffed