This! When I used to travel for work, it annoyed me to no end when we went to great foodie cities and the people in my group wanted to go to Applebee's for dinner. I like quite a few WDW restaurants, but too many people keep ordering the same horrible 'burgers, fries and pizza' that they are comfortable with.The beauty of a captive audience.
There are a few hidden gems amongst the sea of mass produced mystery meat dispensaries, however if the guests continue to patronize quality establishments such as the Electric Umbrella and Pizzafari (now serving ketchup with bread and grated cheese) then what motivation do they have to step up their game.
In a similar vein there was a bar near me that charged twice as much for Bud Light than any other beer. The owners were tired of people ordering 'the worst beer they had' so they overpriced it and people still ordered it.