I doubt most folks put more than 2K through a single gun a year. Competitors ain't most folks.....
My usual guideline is that by the time you've spent 20X the original purchase price of the gun in ammo, you've gotten a fair value from the purchase.
With suitable cleaning, lubrication, and the replacement of wear parts like springs, I'm surprised if a pistol fails in less than 20K.
I'm not really surprised to hear a good gun running above 50K.
If I was relying on that gun, I'd probably retire it to back up status or just a training gun above 50K.
Guns will wear out, but if it's a good quality out of the box and you take care of it, they should last a long time.
I see guns killed more through stupidity than wear. Bad reloads, injudicious use of the Dremel, or neglect kill more pistols than wear in my humble opinion.