I've got a few Dr. Grabows that have seen better days but they are not beat up. The stems are just dull. I think the Meerschaum pipe im smoking from the 40's is probably the most "beat up" from use. its a short bulldog with a squared shank and lucite stem. The Bulldog is in the middle. Those are my cheapies except for the Nording.
The MM Legend I started with in June of this year looks like shit. The bowl has swollen and cracked around the middle, especially near the stem. There doesn't seem to be any break from the inside. It still smokes like a champ.
I think at first, and often still, I pulled on it a little to aggressively. I'm learning.
I've brought some real beaters back from the dead. It's good practice for when I find a highend diamond in the ruff. Most of my regular rotation is in good shape. I take care of my pipes. I've never understood why someone would buy an expensive pipe and bang it on an ashtray, or never run a pipe cleaner through it.