With all of these theories, no one ever mentions what A gets out of each thing that he and/or she has done to the girls, their parents, and Alison. Revenge against Alison and the girls for some petty high school thing, but then why would they do the things that have affected their parents? Why send Mrs. Marin to prison (possibly to protect CeCe, but then wouldn't A go after Travis for telling the police that it wasn't her?)? Why drive a car into Emily's house (to ensure that Emily needed a place to go, which conveniently ended up being Alison's bedroom?)? Why attack Ella with bees (to ensure that Aria would persuade her to go to Vienna?)? Why drive Spencer crazy (to ensure that she ended up in Radley so that she would take Mona up on her offer?--Mona's motive maybe)? Why send Zack the note that was "from" Hanna (create further friction between Aria and Hanna; dividing the liars)? Alison didn't say anything implicating the girls, but she did entirely remove herself from suspicion without fully disclosing her version of events from that night (Spencer went back to sleep after their confrontation, according to Ali in A is for Answers). Why did she leave out this detail? She had to know from their questions that they thought that it was Spencer. The police know that there are holes in Ali's story, according to Mrs. Fields. Hasn't she still been removed from scrutiny too easily?