^You have to be on a server to use the store and unlock things, but if you look, some of the unlocks can be purchased just for that server or for the whole account. It does work since so far I've been able to buy a bunch of unlocks on the Harb GTN (hide head, unify colour, extra cargo bay, companion customization etc.) and they all work on Red Eclipse and every other server I've tested it on. One naturally assumes that the "(Account)" versions cost more CC. Not sure how much the difference in price is though.
The only bugger of it is that as far as I can tell, the race unlocks are all tied to the legacy system and so are indeed server specific.