to be fair, unless you hang around on dedicated hardware forums, it's not the sort of thing you just know when building a PC. i know the first time i put a pc together, i'd never been on an a forum. i remember buying some horrible beige case with included PSU. it did me alright actually.
it's only when i encountered a few unrelated problems with the build that i stumbled across forums like this one. and then of course you soon learn how important a decent PSU is.
I hear you, but its arguably the most crucial part of a computer. Without a power supply, no other component can function. If you knew that you could spend £50 to £100 on a 500W PSU if you wanted to, you would question why there is a 500W included with a case for £30
From that you could deduce that there is going to be a difference in quality and reliability, and I think I would spend £30 or £40 to ensure that my £500 PC doesn't explode 
You are after all, essentially trusting it to provide delicate hardware with the exact voltage etc that they require.
I say this now, having been moving in these circles for years as you say. I'm not sure if I would have taken the same view previously... But I think I probably would have paid more for a half decent PSU rather than the included one if I knew that:
- It came included with a case for £30
- I could pay far far more for one
- it is responsible for providing expensive hardware with voltage
- if it gets it wrong it could easily ruin the entirety of the PC
Luckily the OP found out the easy way

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