Disney’s ticket prices are designed to make you stay for multiple days. Here are the ticket prices:
Walt Disney World Ticket Prices
As you can see there’s a huge drop in per day price if you stay for 4 rather than 3 days ($73 vs. $56.25). And if you stay 4 or more days each additional day increases the total cost by only $3. Not counting the extra food and mouse ears you’ll buy, of course.