It's probably that darn "length of stay" bonus. I think a lot of people (newcomers) don't know about it and are often SHOCKED when they log in at the first available minute of their FP window and don't find things available, not realizing that people have been booking those Fast Passes days before them.
I wonder how many people try to "game" the system:
1) Book a long (10-day trip - get their fast passes for the end of the trip and then simply cut out the first few days of the trip to the lengthy they really wanted.
2) Book a long trip, get fast passes .. and then cancel that room reservation (and just stay offsite). I think your fast passes are still retained in this case.
Definitely feel that with all the Disney Springs hotels being able to book at 60 days as well, that the amount of people trying to get it at 60 days is obviously larger too.
Wish they could just implement a system where there is no "length of stay" bonus. 60 days = 60 days. While it would be a pain to schedule your FPs every day for X days, it would be fair for everyone.
Frankly, I wish they would just ditch the 60 day planning mess and do what
Disneyland does .. just make it so you book them day of -- giving you the benefit of skipping the line, but the flexibility to go to whatever park you want without advanced planning (but WDW doesn't want that obviously, they want to know ahead of time how many people are coming to X park).