A Towing fool broke my key off in the ignition! It cost $250 to fix. The know-it-all mechanic said that there were "lines" scored on the key, probably from some problem in the lock mechanism. Yadda Yadda.
I've had my last car (and keys) for 20 years, current Kia for 6 years, with no keys breaking off in the ignition.
The locksmith did not note any problems in the lock mechanism for the ignition, and did no repair for whatever was "scoring" the key.
It's obvious to me that the key was improperly and violently torqued, causing it to break off in the ignition, but I was wondering if this has happened to others. I think it's a scam to cover up for improper violence with me car.