For all the trolls and whiners on this thread, I have the perfect solution for you!
Use the earbuds that came with your phone! They're tied together and to your phone, so even with all the contact sports you seem to be playing on the subway, you're almost sure not to lose them! Also, there are no batteries to wear out and replace! Also, they were 'free' with your iPhone! Finally, even with all that, if you still manage to lose them, smash them, or your barber accidentally snips one loose, you can get them replaced for only $29!
Problem solved.
Yeah, but but but... What if I'm ripping Oak boards on my table saw, and the cord gets snagged on the blade, hurling my ear pods backwards into the wall behind me at 110 miles per hour. And I only have a $20 bill in my wallet. THEN WHAT?