I have a set of PX200-iis and some Monster Turbine Pro IEMS which have both developed faults. The PX200-iis have developed a fault in the cable (I think around the inline volume adjuster). The Monster Turbine Pros have a fault whereby the right speaker cuts down to about half volume/power after listening for a while (not sure what's causing this).
Are people ever interested in buying headphones in need of repair? People who have the wherewithal to repair things, for example.