As a subscriber, I'm concerned that there will be more items in the Cartel Market that I will want to purchase than Bioware will give me coins to buy items. Will subscription players be able to use in-game currency to buy Cartel coins? As a in-game item collector, having to make additional real life purchases was the big reason I left my last MMO. Will this be the case in free-to-play?
You are basically asking if Bioware will let you give them more money.
I'm quite confident the answer to that will be an astounding YES
I'm sure there will be lots of vanity stuff in the store only available there. If you feel the need to have them all and that in turn puts you off the game I can't say that's the games problem.