Pay attention to how you pull it. Since your saying it's "worn", I'm guessing your not breaking it from over-extending it, but rather letting it rub on the engine or housing as you pull it. Pull it straight out so it doesn't rub on the housing and it should hold up for quite some time.
I have a few that are more than 2 years old and they still look fine. Dirty, but not frayed too bad.