Is a profession worth it?

Today i'm pondering if a profession is worth it. Recently I have had an urge to create a JC. Why do i want this some people may ask. Well i want to be able to craft rings and necklaces to DE. I have no true intrest in the gems though they will turn a nice profit also. Im wondering if an investment into maxing my JC would be a way to increase my gold making dramaticly. If i were to do this i would purchase ore and drop mining on my warrior. Which would make him a BS/JC I would then follow the wow-proffesions guide to leveling JC. To turn a small profit while leveling I would DE the crafted items. except maybe the pre lvl 20 rings and necklaces they can turn a good profit selling to alts. Once I reached 450 i think i would purchase saronite ore to start out building my empite. I would craft the blue gems and save the greens. After saving enough green gems and making some cash off the blues I would begin to purchase the eternals needed to make rings and necklaces. After crafting them i would DE them and sell the mats i make. This could turn a great profit