*UPDATE MAR 1 2013* - This farming method is no longer reliable since the last map changes and Piranha nerfs.  It can still be done, but it is a little harder.  An easier way to farm Platinum as of the Reckoning DLC is here: http://girlplaysgame.wordpress.com/2013/03/02/mass-effect-3-the-new-way-to-farm-platinum-on-firebase-glacier-hazard/ Time is...