It is most definitely not rarely done. You can look on the websites of the schools you are interested, they usually talk about transfer students. No one looks down on it IF you have the grades to transfer in. But alot of people like the school they chose and get comfortable with it so they stay. Since my LSAT is low, I am hoping to transfer into the schools I really want to go to, if I do not get in. The focus is not so much on the LSAT anymore, but more on the GPA you got in Law school, and your accomplishments there.