I've noticed that the less I pay for earbuds, the longer they last. I've paid thirty or forty US for decently good earbuds with the rubber tips and some pretty excellent passive noise cancelling and had them break on me after three or four months consistently, but when I paid like 10 bucks for a pair of cheap Sonys, they've now lasted me almost six. Therefore, I propose that the durability of a pair of headphones be defined as inversely proportional to their price. Thoughts?