Platinums also suck because they have an itty bitty pin electrode surrounded by ceramic. They foul real real easy. With the coppers, you have a huge (well, relative to the platinum) electrode. It takes quite a bit of gunk to foul those plugs.
Plus.... I dont know about you good folks, but I always buy 10-12 plugs when replacing mine as I break at least 2 during install and usually another one later on while working in the bay. If you break a 99 cent plug, whatever. If you break a $5 or $7 plug, thats a different story. I'm running 99 cent ford explorer champions side gapped (40-p's take a different plug). I let the 1200 MJ ignition system make the fat spark.