It’s a combination of things. Definitely ingrained tradition/habit, disinterest in anything else, subjective value, and mental health. The last one, mental health, is a big one. They can be found online, but I met some of them in person when I worked at the park. They have an unhealthy and frankly disturbing obsession with Disney, and will do whatever it takes to satisfy their cravings.
I would agree that most people likely notice the things going on at the parks. As long as they can enter the parks and meet their favorite characters and ride their favorite rides, they’ll be content. The rest doesn’t matter. Disney knows this. This is why they can refer to their main fanbase as “unfavorable guests” and charge up the wazoo; they know that no matter what they say or do, people will purchase passes and show up anyway. They could refer to keyholders as “a$$holes” and they’d still be online, desperate for the opportunity to renew lol. Disney has already established their reputation, decades ago. This certainly helps. I agree that it’s a mutual relationship. The fans get their fix and Disney gets their money. Good for both.
I let my pass go in 2019. I also miss 2015 Disneyland and back, but it is what it is. I’ll drop in here and there when I want to, but not often. I enjoy talking about what’s going on at the parks, but I don’t necessarily want to go.