Nothing is guaranteed in this game.  We take risks, sometimes it works out, sometimes it doesn't.  You can blame conspiracy theories and evil Chinese corporations or you can learn from your mistakes and do better next time.  I'm sitting on 9 heaters that are only making about 40% of what I predicted they were when I put the order in - I was wrong.  No biggy, live and learn.  The big takeaway is to source my PSUs elsewhere next time around!