I can understand being upset when others around you get something promotional and you don't. I think its part of how we all like to get great deals, and plan, plan, plan!! That's part of the fun of it. I don't feel entitled to get a discount, I just like to play the game and get the best rate possible!!
From the marketing side, I do think (I hope!) there is a plan even though it seems postcards are sent randomly to both non-users and users of disney properties. I am guessing that Disney Marketing has segmented consumers into different groups based on demographics (age, marital status, # of kids, zip code, etc.), and usage. Some people who fit a certain profile (maybe they have little kids, have never stayed on site and requested a planning DVD) are grouped together as prospects and receive a certain promo at a certain time. The goal is to get "trial" from these folks--get them into the Disney system.
Someone who has come every year might be classified as a repeat user...they might get an incentive to return more frequently, or at a different time. AP holders getting a discount card when AP rates aren't valid makes sense--they are heavy users who might be enticed for a quick trip at the right rate. Even DVC members makes sense if it encourages (as one poster said earlier), INCREMENTAL trips above what a heavy user might already "buy". Each mailing should have a strategy--trial, repeat usage, increased frequency, retention, etc. It's not a perfect science, and ideally, Disney tries to add things to each consumer profile about attitudes to better understand who would come for the first time and/or more often. There are some interesting marketing tools out there that let marketers know what magazines you subscribe to, other lifestyle/attitudinal things about you--it helps them decide which segment to put you in.
I was, however, concerned (as a shareholder) to read the post about someone who got a discount card while they were holding a future reservation. They should be able to screen for that and pull that name of the mailing list. Maybe the timing was such that it overlapped. But from a buisness perspective, you don't want your consumers to "trade down" to a less profitable option if they are going to buy from you anyway! That is the risk with giving promos to heavy users, even though you have the most chance of converting the promo into a sale with them--you just hope it's incremental.
BTW, I got a card this fall and it worked perfectly for Disney. Our last trip was 2/03. We weren't plannig a return trip for at least another year. I got a card w/ $49 rate, there was a fall break with a couple of days off school, and boom--instant, incremental trip for 5 days in October.
So sorry to be long-winded!!!! (p.s.--I'd go again if I got another great discount card, but less likely to go for another couple of years without it--hint-hint Disney!!)