What on earth have you been doing with them? I'm still using the original lightning cable that came with my iPhone 5 getting on for 2 years ago and it's still in near perfect condition...
He is right,Apple charger cables are poor quality,in less than 2 years I had to change my iPhones cable twice and my iPad air cable is on its way to get ripped apart,needless to say I've been using them normally as I would use any other cable.I've never had any problems with other usb cables ever and they seem to last forever.
Sadly Apple cables are very flimsy,and thats a fact.