at the end of wrath, 2/3 of my guild were JCs. almost all our main raiders including myself were.
fact of the matter is, you're oversaturated. there's so many JCs out there now that you're not gonna make any money cutting gems. cut gems are now so cheap on my server that I swap them around like candy in my gear for different raid encounters or roles. 60 stam gems, 40 mastery gems for 10 gold? np.
I ditched JC/BS at the end of wrath seeing that this would happen and went engi/LW. I made the entire cost of the switch plus ~25K gold back in the first week, being one of only about a half-dozen LWs on the server. when blacksmiths couldn't sell orbs for more than a couple hundred gold, I could still get 1K+ because there was nobody else with my profession.
summary: everyone got greedy in wrath and went JC. Now it's biting you in the ass and you can't make gold. thanks for the cheap gems guys, can hardly wait for epic gems to be under 200G within 3 days of their availability since half the JCs on the server already had the "brilliant" idea of banking 500 stacks of pyrite ore to prospect. wrath epic gems were under 200G within 3 days too.