Disneyland has far more breakdowns. I spend about a month in WDW during the year, and while breakdowns are a part of life, they are not nearly as frequent as at DL. When you encounter multiple breakdowns at WDW, it's usually a fluke. However, in DL, it's a daily occurrence to find several breakdowns (was just there for six days). I was told many times it was the computer locking them out of the system.
Your economic theory is wrong. Sorry. I assume you haven't gotten to AP economics or college economics yet since you said you're younger than me and I just took the AP, so I'll explain.
You're thinking on a market graph, not on a firm graph. Moreover, you're thinking perfectly competitive. This isn't a perfectly competitive market. Disney's costs have increased with the recent expansions. They've got New Fantasyland, which increases amounts of workers to be hired. This is a shift left on their marginal cost curve, which raises prices. With the recent expansions, demand has also increased. Therefore, they will sell at a higher price. What Universal does affects Disney, but not in the way you're thinking because of the market type. No worries; it's not an easy concept to grasp,even after you take college level economics (I took a lot of time completely thinking this through myself). You also have to account for inflation. Even though prices everywhere don't increase at the same rate, they do gradually increase. So Disney increases prices. As far as merchandise prices, I've seen more ridiculous prices at baseball games and such and the quality of my product is always good from Disney. Although I refuse to pay that much for a pen. But unique merchandise=higher cost. Disney, when all is said and done, is trying to make a profit.