If you want purely to make money, then probably, except GSM since accessories should be released next week. It's pretty expensive/ difficult to unlock the tier 2 master books, and actually if you've just hit 50 on your crafting classes, you still have the not insignificant expense of unlocking the tier 1 master books (each requires 5 HQ i70 materials -- vanya silk, darksteel ingot, treated spruce lumber, etc.). I've been catching up myself and don't really worry about the gil so much since crafting is the primary use of gil anyway as far as I can tell.