Disney has always been very liberal about what constitutes "Southern California residency." They'll count work addresses and P.O. Boxes maintained in the area. If you can receive mail at the address, you can qualify. Online they accept the mailing address because they will be mailing the passes there; in person they will accept a bill or statement mailed to the address as proof of a legitimate address. Trust me, they aren't
losing money on this. They are in the hospitality industry, they make
more money accommodating people.
I've asked if I can use Southern California discounts (usually a Spring 2-for-1 deal available in local supermarkets) for non-area visitors...their response was "will the tickets be bought in Southern California? Will the guest be in Southern California to use them? Then yes." Heck, we can all purchase discounted tickets during Dapper Days, without being Dapper at all.
As for the OP, it's amazing how much marketing I might get from Disney and Disney partners because of one purchase. It seems every month there are two new Disney e-mail subscriptions I have to unsubscribe from—Disney Parks, Disney Cruises,
Disney Store, Disney Live, Disney on Ice, Disney food, Marvel, Star Wars, Marvel Live, Disney Hotels, Disney Blogs, Disney Visa, Disney Alunai (sp??), etc.—not to mention the mountain of snail mail every day. I get tons of Citi Bank offers as well...but I expect I would get those no matter what.