It's a fair point currently though, I guess. If you want the fancier ones in your hangar or in Arena Commander then yes, you'll have to pay for them. I'd say it's just marketing though; as noted all of these ships will be in-game, no real money nescesary beyond purchasing the game. Insurance costs and such will be negligable, making the LTI and free hangar costs that came as a bonus for early backers a rather minor perk.
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Wasn't expecting a turn around in opinion on Rebirth yet to be honest. Guess it's back on the watch list.