i think most people take 2, including me. however, is it still ok to take it 3 times? like does it make you look kinda dumb to universities? and does some unis actually average your SAT marks?
It is only a myth that one will be affected negatively by taking the SAT more than 2-3 times. Remember, in more times than one, will a lowly secretary or student working in the admissions office write down the highest composite score for the admissions counselor to look at - if not, the admissions counselor will likely get a clean copy of your SAT scores with the composite score neatly highlighted.
No, there is no university that averages your SAT scores, its just that some colleges/universities will not take your composite score, but just the scores from one sitting.