As a newbie to Star Wars costuming, but a long timer at other genre costuming and FX makeup, I am of the opinion that just because someone has the knowledge, they may not have the skil to use it. I do a lot of prosthetic FX work and I openly share my secrets. I have perfected a few interesting techniques for zombie prosthetics in creating spider veins and skin trauma and I am fine sharing, because even if someone knows what I do, it still takes a certain skill level to accomplish it. But they can at least head in the right direction and not waste money on substandard materials and equipment. It's technical ability over natural ability. As someone who enjoys both costuming and Star Wars, I feel it is my duty to pass on knowledge to other like minded fans. Sure, we all want the best costume we can afford and to be unique, but I personally don't think it's good for the community to not point someone in the right direction in the interests of hoarding information.
As far as Star Wars costuming goes, especially that of Stormtroopers, it is very easy to make an expensive mis-step and can really dishearten you early on. There are a lot of unscrupulous sellers out there acting like they are selling quality official armor. I almost bought a set on eBay from a seller who shall remain nameless but sells the sets for $277. I had no idea about recasting and armor quality levels. The auction description certainly doesn't convey any issues. The forums here enabled me to make an educated decision and spend my money a lot better. I still spent a good chunk of money on getting it, but I know that I am getting quality and will be happy with the purchase. I'm fine making the weapons and accessories, but I don't have the tools to make armor. This website has been a huge help and if anyone wants my vein techinque, let me know. I can include pictures, but they are very gory and not for the squeamish.