I see these deep discount futures brokers like Advanced Futures, Mirus, or Amp, etc.. When they say a 500 day margin does that mean it only take 500 dollars to buy one ES contract? And if so what is the cost per point then? is it still 50 dollars per point? or 200? Say I bought a contract at 1170 and got stopped out at 1165 is that a 250 loss or more? Kind of confused. Only trade stocks so have never looked at this.