Similar, but very different. As I pointed out in my other post, other lines also open up deep discounts to the general population on a regular basis, but
DCL almost never does this. DCL prefers to fill their ships with people paying almost nothing instead of opening up discounted prices to the general population. They do not want the general population to stop paying inflated prices, so the general population never sees any discounts. And the disparity with other lines is not as stark. If I subsidize the military on Carnival, I am not being gouged to do so.
It reminds me a bit of private colleges. They get a minority of students to pay full price, which tends to be an outrageous price that does not represent the real cost of the service, whereas the majority pay far less, data shows most less than half of the sticker price. The difference here is that ideally these college prices are income sensitive and not arbitrary. Still, only the super wealthy feel comfortable paying that sticker price. The upper middle class, who can "afford" to pay that sticker price but are more price sensitive, tend to send their kids to state schools- or likely incur debt at private colleges and remain resentful about the situation.
Disney's discrimination has an added arbitrary quality to it that you do not get with other lines, plus the price disparity is HUGE. This is very different on other lines.