i have no experience with glocks at all, this is true and very little experience with guns in general only a few hundred hours.
Ok, well that maybe explains your questions a bit better.
Glocks are not "disposable" by any stretch of the imagination. They are a polymer-framed handgun proven capable of working just fine into the hundreds of thousands of rounds.
They work, and work well. They can be had somewhat less expensively than some other kinds of guns because modern manufacturing techniques have allowed us to build a very reliable, plenty accurate, firearm with much less hand-labor and less expensive materials and construction methods than previous designs required.
i also have no costco or sam's nearby.
He was joking, based on your rather odd use of the phrase "buy in bulk." As though you needed to buy a case of a dozen Glocks or a 5-gallon pail of them -- like the sorts of quantities in which Sam's club and Costco sell their commodity products.
I'd imagine you meant you, for some reason, believed you can't buy certain models of Glock right off the shelf from any dealer, any day you wanted. Or maybe that you wouldn't be able to quickly find a replacement if somehow you managed to wear it out?
You can certainly get any of the Glocks you mentioned, in the quantities anyone would reasonably require, if that's what you want.
but i ask, why is it seen as a good idea to buy a $2000 1911 but not $2000 glock?
There is a whole market and aesthetic that's built up around 1911s (and a very few other guns) which appreciates the artistry and panache of a custom builder's touch, or even the little extra details and attention to precision applied by some of the larger semi-custom or very high end 1911 makers like Les Baer, Wilson Combat, Nighthawk, etc. It's boutique art in shooting form. Super neat-o if that's your thing.
As mgmorden said, it's like getting your custom hot-rodded Mustang or Camero. Sure is cool and fast. Looks awesome. Turns heads. Neat hobby.
MIGHT be better, in some ways, than a much cheaper modern car, though probably not so reliable and not as fuel efficient, or comfortable.
Similar to buying a custom knife for several hundred dollars instead of picking up a regular old Buck from your local sporting goods place. It's neat and makes you feel good to handle it and show it off. There's a chance that some day it will do something that that $60 Buck knife just couldn't handle. But day-to-day, the Buck is just as good at getting stuff cut.
So yeah, getting a custom-built Glock is a little like buying a super-hot-rodded Toyota Camry. It might become LESS reliable than one right off the dealer's lot. But it might look ... sorta ... cool, to some people. And it might get you to work a few seconds faster, maybe. But most folks are going to laugh, because it isn't what they've come to expect, and the justifications for doing it aren't going to make much sense to them.