I bought a CZ Tactical Sport .40 a year or two back that had several thousand rounds through it. I don't remember the exact round count (don't pay attention to that stuff, it will vary from gun to gun if you're looking at it as an indicator of when something will break) but it seems it was well past 10,000 rounds.
A competition pistol. Shot enough that the barrel broke in half right at the end of the chamber where the rifling starts. I kind of wish the seller had included the broken barrel parts with the rest of the stuff I got (slide, frame, extra hammer/trigger/safeties/magazines/sights, recoils springs, etc., etc., etc.) Installed a new barrel in it and shot it a few times. Awfully big/heavy and a scary light trigger. Range gun only.
I don't think most people count rounds through a gun.
I don't think most people shoot them very much.
I don't think most people take good care of them and the abuse you see on the outside is due more to poor carry/maintenance practices than lots of rounds and hard use making holes in things.
When you see people (on the internet) asking about whether or not they should wipe the metal down with an oily cloth, or why their pistol starts to fail after a few thousand rounds with no cleaning/lubricating, or what ammo is the most accurate in their model/caliber gun you know most people don't know as much as they should about the gun they've bought/used. They're reading reviews on the internet and trying to buy accuracy, or dependability/reliability instead of working with themselves and their firearms to become more proficient.