I have personally stayed at every level resort at Disney and book trips for people of all income levels. I will echo much of what has been said. The deluxe resorts already provide greater perks, concierge level, more pools, fitness centers, spas, greater dining choices, and bigger rooms. You are already getting premium accommodations for your premium price.
There are also tons of perks if you book a specific premium or platinum package, including complimentary golf greens fees, golf lessons, water sports, outdoor sports, backstage tours, and cirque du soleil.
There are other ways in which 10 grand will get you special treatment. You can buy time with the characters through character meals, avoid waits with dinner and show packages, or purchase tickets to the after hours parties.
I enjoy the extra perks of being on property and feel they enhance the experience without causing undue harm to the off property guests, but I think part of the charm, and marketing philosophy, is that staying on property is special no matter the resort. This gets people interested at any income and allows them to grow into the deluxe resorts as their income grows.
I would wager that a large percentage of deluxe guests were value guests at one time.
I do have to disagree with previous posters that the the theming is better at deluxe resorts. On a strictly theme basis my hands down favorite resort is the All Stars. It isn't the best resort due to its location and lack of amenities, but I love the look and feel.