I think this is your best argument. Recently I visited Big Cedar Lodge in Missouri. I stayed in one of the nicer cabins they had at about $325 a night. There were 'free things' to do really nothing special, but every time I went to do an activity beyond putt putt golf it cost me another $50 or $100. I would have gladly paid $500 a night if they'd include those activities rather than nickel and diming me. Do I have the money to do all of the activities, yes. But I don't like the feeling I have that I have to take my wallet out every time I want to experience something.
There are a million facets to this argument. Another poster noted that you get benefits for staying on property etc with Extra Magic or early access to FP, but that seems more reasonable as you are GUEST of the Resort vs. a guest of the PARK. That doesn't strike me as 'exclusive' but rather more of an inclusive package for staying at Walt Disney World rather, a perk.
Can you argue that paying $150 for park access is a 'perk'? I don't think so.
A few years ago, a friend of mine said, they'd wish that Disney would create a system that would level the playing field for those who just want to come and enjoy the parks. Someone like "me" had such an advantage over others. She was talking about my level of knowledge about the parks and how things worked, what to ride, when to ride, where to stand for shows, etc caveats of the parks that made my families experience different. The thing is, I was working to create all of that. I had done the research and the leg work to make that happen and EVERYONE that came to the park could have had the exact same experience. No one was able to PAY and stand in front of me, I was orchestrating it and to many people I think (regardless of the financial resources you have) that is the difference. What I was doing, EVERYONE had access to...while my friend thinks it's more fair now, the reality is, if you don't know all the things you have to do or pay for to get access, you're worse off than before.
One other point was about paying for Dining Experiences and not having to wait to meet characters. I don't know that I see that the same way as you're paying for a meal that has 'entertainment' included. That's not paying to stand in line before me, that's paying for an additional 'experience'. If I don't want to wait to see Princesses, I show up at Rope Drop and have no line...again I make it happen