Next, if guests can only use it at one park per day, that would discourage park hopping, thus encouraging guests to spend LESS money.
I posted this comment earlier in this thread, but I really don't understand the comment that it will discourage park hopping if guests can use it at one park per day. To me, FP+ will make park hopping much better because I can get 3 fast passes at my afternoon/evening park in advance (and forego fast passes for my morning park when lines are shorter) rather than show up in park 2 and have all of the good fastpasses gone or for many hours in the future. Right now, I can't go to DHS in the afternoon and expect to ride TSM. Same for Epcot and Soarin. If I show up at MK in the mid-afternoon, it will be many hours before I can use my FP on BTMRR, SM or PP. But with FP+, all of the sudden, I can do something else in the morning and have fastpasses in hand for my afternoons. That is a huge improvement. In fact, for my June trip, I had been looking forward to FP+ and being able to split a day between AK (am) and DHS (pm), but now have to re-think that because TSM is the main thing we want to ride at DHS and we wouldn't be able to do that (too bad there's no way to exchange fastpasses - like get an EE FP in the morning for an afternoon return and trade it in for TSM when we switch parks!).