I see your point there, but yet there are some things that are only offered on the shop. For example that new speeder with lights. Why should I have to spend cartel coins on that when I already pay 14.99 a month? Should I not get that anyways just because I paid for my monthly sub?
All the items that are not offered to subscribers in the Cartel Market are either fluff like the speeder you mentioned, or convinience unlocks like the legacy unlocks or the space equipment. None of them are necessary to preserve your gaming experience.