Gonna totally disagree here.
There are a variety of off-the-shelf options available that you can order from such places as Midway, Top Gun Supply, etc., that are of much better quality than Uncle Mike's. You can have them in a few days, and they'll provide years of good service. TGS usually has some Milt Sparks (a custom holster-maker), Ritchie Leather, Milt Rosen (another custom maker) Express Line, Don Hume and others in stock. Midway has Galco (always reliable, although a bit overpriced), DeSantis (some really good options at good prices), and Bianchi (still good stuff) in stock. Lots of decent Kydex, including CompTac, Blade Tec, Safariland, Blackpoint Tactical and many others out there, instantly available, in internet-land.
If you like your handguns, they deserve real holsters. As others note, buy once, cry once. Life is too short to carry a nice handgun in a crappy, ugly holster that isn't fitted for your handgun, provides no decent retention and doesn't even conceal well.
Finally, a plug for the good gun-belt. Geez, I wish I had a dollar for every person I've ever seen packing a handgun in a holster on a cheap, thin belt.
You make good points, but there can be a lot more to it than that. In my case, I do not carry OWB or in a traditional location. As such, my holster options are severely limited (no matter who makes it or where you get it).
Also, I agree that there are plenty of "off-the-shelf" options available. Then again, they all likely cost more than five-times than the OP paid for his holster. And, the part of my post that you quoted referred specifically to custom holster makers and the associated wait times. Not sure what you are getting at there.
If a person carries at 3-4 o'clock, IWB or OWB, and is right-handed, then the holster world is his/her oyster. It's simply a matter of cost and availability. I would also agree that a holster has to be fitted to the model of pistol in question in all cases.
I DO NOT agree that a holster needs to be expensive or "nice". Buying an expensive holster proves that the person buying the holster likes to have, and can afford an expensive holster... and that's all.
Why on earth would anyone care about how a holster looks? I know some people do, but that isn't relevant to a holster's function. Who might you show it to? And why?
When you say, "Buy once, cry once" when referring to holsters, you are forgetting the very important point that you will be lucky to find the "right" holster within the first ten that you purchase for any given handgun. What if that $180 Sparks or $250 5-shot, or $200 Rosen doesn't fit you well? It might hurt you. It might not conceal your weapon. Should you buy eight more holsters at over $100 per until you figure it out? (Lord knows that I have gone this route).
If a holster fit you, fits the pistol, and keeps the pistol where you expect to find it, the rest is just hobby purchasing. Nothing wrong with that, I have many fancy holsters.
Overall, I would agree with you. A cheap and unfitted holster is...not something I would recommend. However, a cheap and fitted holster is nothing to sneeze at.
Just my opinion.