The US DST change in 2007 cost an estimated $500 million to $1 billion: http://www.csmonitor.com/2007/0307/p02s01-stct.html

DST has cost me many hours spent debugging. I will be very happy if/when it is abolished in the US.

I have a clock from one of my former employers that's imprinted with "We survived the 2007 DST change!"

The clock is broken.

> DST has cost me many hours spent debugging. I will be very happy if/when it is abolished in the US

Because then the bugs will be rarer and even harder to find, as they'll be caused by interfacing with DST systems when yours isn't.