Mac's are easy enough for mom to use; if she wants to surf the web, check email, av chat, etc....
However if your mom also runs final cut pro, and half a dozen other complex editing programs, while at the same time creating and deleting gigabyte sized files constantly, and is in an office cubicle next to 20 macs just like it with 20 other moms doing eactly the same thing, you need a mac guru, like myself if you want all those macs to play nice with one another and not crash constantly. Macs in herds are fickle creatures.