Could you consider all the auxillary items/vehicles in Online as story content, though?
You're misinterpreting the point. The point is that in the time it takes me to collect all items in one game, I only get enough to buy one item (without upgrades) in this game. Even worse is the fact that the garage is useless with cars to put in it, but the cars can't go anywhere unless you have a garage. And since GTA Online has an abysmal car management system, if you want to shift cars from a temporary garage into your executive garage when you finally get that, you have to manually drive every car 1 by 1 between the garages.
I'm sorry, but it's just outright bad taste in my books. Not enough to kill my enjoyment for the game's other mechanics, but I certainly believe they're really trying to haul in some last minute quick bucks before they put a round in GTA Online to make way for whatever online service Red Dead Redemption 2 will offer.
EDIT: And to anybody saying I don't know how to make cash, you can forget off 3 pages ago where I posted my entire car collection, or pages before that where I showed off my Yacht, apartment, business, all my guns and clothes (I've unlocked every purchasable weapon and customisation item in the game), all my Pegasus vehicle unlocks and more. I'm well aware of how to make money in this game, but it's almost become as tedious and painful as the LEGO Games.