My wife and I are heading to Orlando this November and have purchased all our tickets in advance. The Disney tickets were added to our Disney World booking and we got Ultimate 14 Day tickets for £235 each, (approx $375). We also purchased Orlando Flex Plus Tickets, giving us 14 days unlimited access to Universal Orlando, Islands of Adventure, Sea World Orlando, Busch Gardens Tampa, Aquatica and Wet 'n' Wild for £199 each, (approx $320). As both tickets are effectively 'park hoppers' we think that gives us pretty good value for money.
It seems that theme park tickets are pretty much like rail tickets over here:- buy well in advance and get terrific value; buy on the day and pay through the nose. It was ever the way....
I think it sucks. The prices they are charging are ridiculous.