50k does sound a bit soon. I thought you would get at least 70k out of a rotor. The stock Ford pads are quite hard as they contain a high degree of metal & hence chew through the rotors faster. You are better off with a softer low dusting pad from Bendix or similar.
Also, if you do need new rotors you might consider going for DBA Longlife ones. I've heard they are quite good and relatively cheap. You can buy them online on the AutoSpeed web site. Here's a direct link to the page: