Ok.. used the search function and didn't see any threads on this subject here.

Why would a group of PC's ever opt to use Bacta tanks which take hours to days to heal you, cost 10k/ton for the bacta and needs a person with an advanced skill, or a pricy droid to operate the bacta tank itself, when med packs heal you just as good (by the rules as wrote), take only a full round to use and are easier to acquire?