Spending $200 and $50 is a whole different story, you are taking it to an extreme when I mentioned a medium in between of spending a few extra bucks. Spending $50 on a corsair cx500 and spending $70 on a better power supply with decent components sounds reasonable.
Someone doing it different than me has nothing to do with "doing it wrong". Antminer have limited warranty, people live in different conditions. If you have issues with your power supply 4months down the road you will wish you had spent $20 more. Anyone who appreciates hardware knows the one thing you don't do is cheap out on the power supply.
CX500 is $30 AR not $50. I've bought those and would buy again if I needed a good cheap small PSU. Just like I'd buy EVGA 1300 again if I needed a good cheap powerful PSU. I don't know what Antminer warranty has to do with anything, or living conditions.
"Doing it wrong" are your words not mine. See, I don't tell how you should run things, but you seem to be so worried that others are doing it not according to your rules that you resort to calling them "dumb" etc. I will not wish I had spent $20 more, or $40 more as the case might be. I will be happy that I can afford a spare and zero downtime rather than losing revenue while RMAing a "high quality" PSU (yes, those break too). To each their own.