Actually P2P is a cheaper route, one would pay significantly more in a F2P due to impulse buying.
As of now they have not slowed down or hindered gameplay in an attempt to get us to buy something, so all of this is still just speculation. Even if all of the signs point to bait, it doesn't mean we have to bite. Knowing that additional storage is going to cost us, unnecessarily hoarding every item that you come across is trapping yourself in a corner so you have no choice to bite. Sad to say guys but its not 2003 any more...15 dollars doesn't go as far as it did 10 years ago, so they're going to try and get as much as then can, and I don't blame them. MMO's used to be playgrounds, but they've grown up into theme parks. Some good ones charge admission, some don't...but all exist with the intent to sell a good time at a premium.
Long story short: FFXIV charges for extra storage. If you don't want to pay for extra storage, then work with what you have. I'm out of tissues.