Honestly speaking you are wrong. The PSU is one of the most important parts to be taken into account as it malfunctioning will take with it, in the worst case, the rest of the setup. Quite something to worry about if you ask me.
There are PSU so bad that it is a joke to try to sell them as equivalents of better ones. And note that I am not even referring to high end ones (gold ones) but standard PSU vs less bad ones.
As you can see not *all* are high quality today, we all would wish it would be that way, and, yes, systems of the owners that actually know what they are buying do need the quality power (% of efficiency that is) their systems demand. And if they do not need it now at least they have made a good investment when it comes to future upgrades.