Your citation of the "owning the park" metaphor brought back a memory from a few years ago. The ownership feeling is (or was) a specific selling feature for the AP. There was a series of funny TV ads featuring a guy walking through the park, and through snippets of conversations with cast members conveying the story that he's going away on business or something and he's giving them their orders to hold down the fort, keep an eye on things, etc., as if he owned the place and they all worked for him. At the end they had a slogan or tagline to the effect that if you buy an AP you'll feel like you own the place.
Of course, it was hard to square with some of the things passholders are denied, like EMH, admission during MVMCP and MNSSHP, as well as more recent additions like free dining, which is probably why the ads only ran for one or two years.
But anyway, if contributing to the "owning the park" feeling was the purpose of EMH, then it almost certainly would be extended to APs, and possibly even exclusive to AP and DVC.
Not that I don't get your point. They want people to stay on property, it brings them extra money, and they're willing to offer this perk to make doing so more attractive.
My counterpoint is that it's not like I'm nickel-and-diming and spending their resort money elsewhere. I live here. If I had all the money in the world it would still be stupid to buy a room on property. On top of that, even though I'm not personally staying at GF, there are six people who are and who would not be if I didn't live here. (Four of whom, I might add, will not be partaking of EMH anyway).