It's not related to cost - we certainly can/would buy park tickets. It's because it's our 4th trip in 2 years and we were thinking of trying to do something different. We searched other vacation options yet found for our family, Disney really is the best location for us right now! Plus, we often leave our trips feeling like there's so many other things to do so when we made a list of ideas, we were thinking they could easily fill a week! Our kids love Epcot and Magic Kingdom. They didn't care for Animal Kingdom, though I'd love to see it now at night. We've yet to visit HS. Perhaps we'll do a few days of parks and try to squeeze in more activities on other days. As another poster mentioned, I don't want to miss out on FP+ so I'd like to decide before our 60 days!
Thank you everyone for sharing your thoughts and experiences!