Why? Because a 25 year old walmart clerk shouldn't be making as much money as a teacher with a college degree!
I know two girl's quiting their tutoring position's at their local sylvan branch (nick named 'hamburger hill') for walmart. With walmart you actually have job security - even benefit's. More so, you don't need to feel like your conning over evry parent who walks in your door.
Your giving people what you pay for!
If Walmart charged as much as sylvan does (compared to what their spending) - a gallon of milk would cost 12 dollars.