6) She also wanted to write under this name to get back into writing a different genre without any hype. 

J.K. felt publishers would be bias towards her if she used her real name 

To send in a manuscript as one of the most successful authors of all time, almost guarantees a publishing deal. This is the reason Robert Galbraith was introduced in the first place. J.K. explains she wanted to get back into the writing industry without a bias thought, and she succeeded in that too.