At the beginning of the year I had one MacBook power adaptor.
It was starting to get frayed around where the cable leaves the block and it would cut out. Time to buy a new one.
A few months later, lose it on the way to Kenya. Time to buy a new one.
Get into the office one day, it goes bang. Go to the Apple store and complain, get a new one (free at least).
Get a new MacBook because the old one dies. Now have two, great.
House gets burgled and all power supplies stolen. Down to zero.
Time to buy a new one.
Please make them cheaper Apple.