However, I have a 400 Cybertech and I was really looking forward to have crafted Graded 7 parts as a valuable addition to my repertoire. The fact that they can be bought with coins bothers me from a crafting perspective -- how much of my potential profit as a crafter will be lost?
it's not the end of the world or anything, I just think it would have been nice to be exclusive to the fleet/daily vendors and cybertech crafters.
Most likely, all of it. People now flood GTN with those parts in hope of making quick money, and often they cost less than single stabilizer. With those parts avaible in cartel market, there is absolutely no reason for crafting schematics. Sure, you can craft it, but most of the time it's better to just sell mats and buy one from GTN.