Do you mind em asking what is their margin account limit? As E-trade only requires I have $2000 in my account to have a margin account which permits me to do intraday trading, but Sharebuilder and many other sites require I have 25k.
Also if you are in this forum and you are using TD Ameritrade, I am assuming ATRN is not one of those stocks you claim they prevent you from investing in....correct?