Duchess - Oddly, in my experience $$ doesn't really mean much at Disney (if you're not also famous!). We've often stayed two weeks at over $400 per night and never been acknowledged in any way. At other hotels, we get welcome back gifts and whatnot. Year after year at Disney, nothing! We think it's kind of funny.
I did get a postcard and e-mail from Disney last week. Unlike those who got a discount offer recently, though, I got a message that said we notice you always visit in November -- hope you'll be here again this November! I guess Disney has our number!
In any event, the couple that got in w/o being at AKL Concierge was probably friends or relatives of a CM. Or may even have been part of a group with part of the group staying at AKL Concierge. I could see CMs as a courtesy letting a couple who's part of a group go along if most of the group is at AKL Concierge. Especially if it happened to be just adding two people.
As for the Safari itself, we've done it, thought it was fun but wouldn't bother doing it again.