Using a bacta tank will most likely require a bacta refill, while will be expended (like ammunition, basically) through that use. I wouldn't expect an additional charge.
I wouldn't expect droids to charge a "fee", either, but greater usage of a droid may cause it to require more frequent maintenance, or something. I'm not too sure what's planned for droids.
Of course, nothing is certain until the rules are finalised, coded, and published, so any answer you receive is speculation at best.
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
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