Actually there is a culture of "I am on a mac, why do I need backups" that exists because things are so easy to setup, and faily so infrequently.
Not on the server level, but on the desktop / user experience level. And if they are buying a machine that apple is selling as "easy to use as their desktop machines" with "no IT required," then yes, Apple is mis representing their product.
Of course, Apple can't sell enterprise level equipment worth shit, and knows it. 90% of their sales staff (in enterprise) would rather sell a product and never have to maintain contact with that customer until they need to buy something more again. Anything requiring more work or knowledge than what they had anticipating and deployed in house will rarely get done, unless you are buying MILLIONS of dollars of equipment.
As I've said up thread, the chances that they have an IT person at all, as in someone whose job it is to maintain the functioning and support of their IT infrastructure and services, and to secure them, is probably ZERO. They are web coders and dot commers, who just had an idea, bought an xserve, and threw their code up on it and had it run, and then collected ad revenue.