Every single Apple charger/cable I've ever had has frayed or gotten close to it, FWIW.
I'm not mistreating them. My ancient Thinkpad chargers are doing fine and they see lots of use. They're thick and ugly, with the cables themselves almost as big as the old barrel jack connectors, but they still feel safe and reliable.
Heck, my old Nintendo DS chargers are still fine too.
I deliberately didn't mention the cables, and I'm happy to slag on their quality with you.
Glad they finally did the right thing and separate the chargers, which are excellent, from the cables, which are.. white. They're also spec-compliant, which matters more and more with Thunderbolt and the like, but I find that any other reputable cable is also spec-compliant, and is going to last me about three times as long.
I do mistreat them, to be clear, but at that price I should get away with it.
I'm not mistreating them. My ancient Thinkpad chargers are doing fine and they see lots of use. They're thick and ugly, with the cables themselves almost as big as the old barrel jack connectors, but they still feel safe and reliable.
Heck, my old Nintendo DS chargers are still fine too.