Forget the P2P/sub only option.
3 years average $540 + 60 on boxes/expansion, at least you'll be spending $600 on a single game.
The only time I would see myself spending $600-1,000 on a single game is if the game is truly something on a whole different level, which is not in 99% of the MMO's.
Any F2P or MMORPG that requires $50 top per year to fully enjoy its content/features is the only option for me.
Sadly, there aren't many F2P MMORPG's out there that are fun to be played in first place for free. Maeby by 2020 that will change.
Market is overflooded with card/battleground type MOBA/FPS/RTS repetitive/deathmatch/shoot em up games that I remember playing back 20 years ago with my friends on the Nintendo. Only difference now is they are 3D and better 3D graphics than 10+ years ago.