F2P actually makes sense for PlanetSide 2, as PS1's biggest problem is that you needed a huge number of players for the game to be any fun. In fact, the Planetside Reserves (ie play to Battle Rank 6) was one of the best ideas in part 1, except for the fact that hackers abused it, as all the extra people on the battlefield spruced the game up from the usual abandoned cat and mouse back hack fest that was going on at the time.
You guys also have to remember that PlanetSide 2 is directly competing with the likes of Firefall, World of Warcraft, Call of Duty, and Battlefield 3. Making the game appealing to the "I feel like playing this when I'm bored of my Orc, as its free and I got friends who have it too" crowd is a smart move here as 10 million people putting down five bucks is the same as 1 million people putting down 50, and PlanetSide is a *much* better game with bigger numbers.
And on cost? Honestly? If PS2 followed a LOL style skins/perks cash shop, I'd cheerfully down a few bucks a month as part of my gaming budget if it meant a new skin for my gauss rifle, or a painted kill count on the side of my lightning tank.