You guys would have a good argument if the options were restricted... because of the GTN people can buy these with credits instead of grinding missions. And most good players will wait it off or get a guildy to craft some parts
Some are bought with commendations, some are crafted. You can't craft a whole set.
As for selling them on the GTN, haha... I don't think any amount of credits would be worth it to the crafter. You'll need thousands more commendations to get the crafting materials to make a single item.