Sorry to hear about your frustrations. You got a bum deal and have every right to be very angry. However, I think you're being a little unfair. Schiit isn't a bad company and Head-Fi isn't a bad place. You bought a broken used amp from a fraudulent seller. That's not the fault of Schiit or Head-Fi. In fact, you did get great advice here. People chimed in to help you, which goes to show what kind of a community we are.
You took your amp to a tech. What you should have done was follow the advice you received earlier. I said don't let this one bad break ruin your audio life. I then outlined a reaonable plan: Send it to Schiit to have them upgrade it to a Valhalla rev2 or to a well known amp builder here for a refurb. The fact your tech wasn't able to do anything isn't surprising and doesn't reflect bad on Schiit or Head-Fi. I'm far from a Schiit fanboy as I have been critical of them in the past, but I'm just trying to be fair here.
I understand what you mean, but when I emailed Jason, he said it would be very expensive to fix it ($199+). Whether it was to make it a Valhalla rev2 or fix it, Schiit would've charged me so much. There's nothing I can do now.