I am one of the aforementioned fools and idiots who purchased an S7 with one fan.  And I'm probably going to get another.
I have them hosted so this is not an eyewitness account.
I have one S7 Batch 3 or 4, don't recall.  It runs at 4.724 Th/s and the temps are 61, 58, 58.  Never had an issue.  Good miner
The new S7 Batch 16 runs at 4.723 Th/s and the temps are 63, 61, 64.  Now it's only been 2 days, but so far no issues.
Are they saving money?  Of course they are.  Is the miner shit?  Doubtful.