I'm quite certain they are to a degree. Disney does need to give SOME consideration to balancing price with the quality of the experience.
Consider this: How would your satisfaction level change if the trade-off for cheaper tickets (or lower increases) was larger crowds and longer waits? Would you be equally satisfied if tickets cost half as much, yet the pathways & shops were crowded with twice as many people and attraction & restaurant wait times twice as long?
About three years ago, Annual Pass prices for
Disneyland increased in price by something like 30-40% in one year. Disney made it known--either overtly or through back channels--that their goal with the increase was to reduce the number of passholders and thin out the crowds.