how much life are you robbing from the devices by making them go faster than originally designed for?  i know it would instantly void the warranty...  id rather have a year at 100ghs than a month at 140ghs

still won't roi

im might be a big shock.... but have you ever heard of a hobbyist miner?   Someone that does it for curiosity?  Fun?  The learning experience?  Most College Educations wont ROI.... I dont see a lack of customers for them.