We used to tip, but we don't anymore...
A few years ago while staying at AKL during a two-week long trip, we had a wonderful Mousekeeper, Hermosifina. She made up our room beautifully every day, sprayed it with a wonderful scented air freshner, and made towel animals everyday. We tipped her a few dollars every other day.
Throughout the first week, we had been having problems with elevator noise in our room. We tolerated it, but decided that for our last week, we didn't want to "tolerate" it anymore. A manager came up to our room to investiage the noise. While she was there, she noticed the many towel animals in the room. We commented on how nice the Hermosafina was, how much we appreciated her, and knew her by name.
We never saw Hermosafina again.
From what we were told from another Mousekeeper, supposedly they are questioned about tips, and are not allowed to accept them, and are supposed to put whatever tips they get in a bank to later be given to charity. The other Mousekeeper we had spoken to said she had never heard anything about Hermosafina, but guessed that she was probably fired for accepting the tips we left her. Apparently, Disney is very strict on tips, and it is not tolerated to accept a gift of any kind from a guest, and tips are not to be accepted if a tip is not part of your salary. And tips are not part of a Mousekeepers salary. The other Mousekeeper said that she is often left tips, but never accepts them and immediately puts them in with the other tips for charity.
We never minded tipping, but don't do it anymore for fear of being the cause of another lost job. I don't know how true this is, but we aren't taking any chances.