I think you need to realise 90% of the items in the cash shop are going to be aimed at getting the F2P players to spend cash on boosts.
Someone like myself who has multiple level 50s and does not need/want to level another character only has Operations and a few more WZs to look forward to, how is that worth $15 a month?
It may not be worth $15. YOU need to realize, that the game offering a non-sub option only gives you choices. If you do not feel it's worth subbing anymore, then stop your sub. You can still play and log in. You can buy what you choose in the Cartel Market or don't at your election.