I think that's rather typical, actually. My friends and family tend to fly whoever it cheapest when they want to go, and they don't really think about the miles (but then maybe they're only flying once or twice a year). It's just too much of a hassle for them to worry about with minimal flights.

I do find that people come to me at work and ask about "deals", though, as they know I have a fair handle on what's on sale out of the Bay Area, and that an alternate airport might save them some money.