i don't think she is trying to get rich selling eggs but just to make a living. 
it's like hiring a contractor. you want one that is licensed insured etc,, and if every one hired joe schmoe off the street who says he can do it for half price it would put the big company's out of business. its kind of like out sourcing all our products to China,,, it hurts U.S, companies and puts them out of business. 
Or if you have joe fix your car in his driveway and dump the oil out back,, it only hurts Frank who has been in business for ever and has rules to follow.
i only have 4 laying chicks so i dont have a lot of excess eggs, but when i do sell them i sell a dozen for $5. at our stores here fresh organic free range eggs go for $5-5.50 a dozen. Why would i sell them for any less, if i could get 5 bucks,, most people say they will pay that regardless,, want to help me out and support my chickens and "the cause"
i dont know the prices for eggs in small town midwest, but if you can only get 1.50 for your "farm Fresh natural fed free range" eggs that sucks!!
its like driving a hybrid car,,, you are not driving it Necessarily because its cheaper,, but to support not driving fossil a fossil fuel vehicle.