I have two “sets” of earphones-one for daily “all-purpose” use and abuse that I use for the gym, out and about, and another pair for “easy” listening-in a controlled environment or when I’m out doing leisurely things that are not strenuous.
On very expensive earphones, there is the ability to “swap out” the cabling and do plug-n-play replacement, but alas, on less expensive, more conventional earphones, this is all but impossible to do; I would look into earphones that have unconditional warranties, if you’re into high-end.
Otherwise, kick around with some cheapies, and treat your expensive ones kindly (including keeping them in a protective case when not in use.
BTW, here are two example pairs of inexpensive and semi-expensive earphones I use for reference; note that the more expensive pair comes from a company that provides a 1-year warranty:
http://www.skullcandy.com/shop/smokinbuds-p-10.html?zenid=c253286aee820016371673df9118ecaf
http://www.v-moda.com/collection/modaphones/vibe.aspx