I use them often enough for it to become a chore to put them in a case.
When they're unused, they're just left on the table. If I'm on the go, and I'm not using the earphones, I just shove them in my pocket.
I use my earphones very often (about an hour a day, with 7 switches from video to music and music to video whenever I change from subway to another subway or bus or walking).
I don't abuse my earphone, but I don't exactly take precious care of them.
That bolded text is the problem then and it's not like it takes very long to put them in a case. I'd get a earphone with either detachable cables or one built really well such as the meelectrionics line if you dont want to spend much.