If this game was F2P, this is how it would be.
No Armory Bonus, no rested bonus, no GC scrolls to increase DoL and DoH exp. Instead you can buy 50%, 100%, 150% and 200% EXP charms in a cash shop to help you level up those pesky alts. These are also tradeable, so you can pay for gil by basically selling these.
Best MP and HP potions would be cash shop as well. Max Ether and Max Potion will be cash shop exclusive, $1 for a pack of 5 or so. Tradeable again.
Only mounts you get are the main story ones. So only Chocobo, Black Chocobo and Dragon from 3.0. Everything else cash shop. As time goes on, rare mounts with faster movespeed than other mounts are released as cash shop exclusive. Tradeable again, best way to get 50 million gil is to spend $250 in cash shop to buy these faster move speed mounts and sell on market board.
Less minions in game, most are in cash shop. All tradeable.