basically, you have to do alot of pedals to warrant getting set up for screen printing. Ink alone will cost you about $20-50 a quart, not to mention retarder, cleanup materials... frames, cheap, are about $40, then you have photosensitive emulsion, blockout fluid, emulsion remover, dehazer... it does get pretty technical for the DIY'er. I screen print trophies right now, but am set up at home for screening shirts and (hopefully soon) pedals.
I've seen some AWESOME and rugged results using the print decals... apparently, the clearcoat is the key to those. And it's easier to do, cheaper, and takes less time. I screen print my pedals, well... just because I can.