Except buying the stuff in f2p games is more expensive than just giving us a sub for it. For example, I have nearly millions of gold in other MMOs. In GW2, bag space and gold and crafting and flying mounts are way more expensive to buy than if they had them for a sub. The trade-off is that they’re optional. Perhaps, however in F2P games you can choose when to spend your money and how much of it you want to spend whereas with a sub model game you MUST spend the money every month or you will get locked out of whatever the sub provides. Maybe in the long run, subscriptions are more expensive? I know that in my case, it would be because I don't often spend money unless there is something in the game that I really want.