When it comes to a chain on the fixie, this is probably THE MOST IMPORTANT component to safety and I can easily justify spending $50 for a chain, when its durability and strength needs to be uncompromising. Whether it's the Super Tough Izumi or a Wipperman, when it comes to chains which are not high profit margin items, you are getting what you paid for in terms of material quality. Getting the "strongest" model from KMC, Wipperman or Izumi is a win-win situation. $50 on a crucial piece of the drivetrain/braking mechanism is not like spending $50 on a bunch of Ti bolts; this is not an optional luxury but an integral part of the bike.