Crafting sucks, I always lose my damn shirt...
I used to craft Disco armor thinking I could probably make a little bit of money on it, until I did the math and figured out a set sometimes cost me over 160% to craft. Nobody will pay that much for an armor set that is exactly the same as Jaguar which can be bought from auction for around 108-116%.
Stealth, another craftable armor from RT, is exactly the same as Martial. It's impossible for a crafter to make money on Stealth armor, you just can't compete with the lootable armor prices.
So just realize next time you see someone with Disco or Stealth that in order for that armor to exist, someone flushed their peds down the toilet.