50 crystals a day should not be a problem, farmers make 500BC / day and more
professions are not really worth
sure, alchemy makes you able to brew that potion that restores 50% of HP but you can also buy that one from auction or just leave it
hammers seems to be cheaper if you just get the teal ones from itemshop, or if you really want to save your BC just use the green ons from anvil NPC; they are good enough
so my verdict is professions are a thing for those who already have "everything" and just get whats left to get for the sake of getting it