LittleBigPlanet has many fans, primarily those who love its extensive creation tools, which can used to craft whatever one's heart desires. So much so that the actual game part of the game is often shoved to the side.
So perhaps this reason, as well as few other obvious ones, is why Sony is offering the game's centerpiece to all, and for free (somewhat).
Among its numerous announcements at Gamescom was news of the LittleBigPlanet Hub:
The PlayStation Blog has some of the finer details:
A brand new level chock full of goodies to collect, exclusive to LittleBigPlanet HUB!
Free access to the first worlds from both LittleBigPlanet 1 and LittleBigPlanet 2. That’s 16 free levels and all the goodies and costumes contained within are yours to collect and keep!
Unrestricted access to LittleBigPlanet’s Create Mode and a full range of tools from both titles to create your very own levels!
The LittleBigPlanet Team Picks! Our weekly updated collection of some of our favourite community levels. That’s more than 500 levels at the moment and growing each week!
Exciting Weekly Challenges! A whole new way to play LittleBigPlanet!
So it would appear that some of the game parts of the games are along for the ride as well. Fair enough. As for how Sony intends to make money, since this is a free to play game after all, the plan is to have you fork over cash eventually, there are few.
First, DLC that one previous purchased for LittleBigPlanet 1 & 2 can also be purchased via the Hub, so that's one way. Though one can also purchase custom creations from fellow members of the community, with Sony taking a cut of course.
When Sony first came up wit the idea, to infuse elements of iTunes and eBay into LBP, they joked about the eventual first "LittleBitPlanet millionaire." Which hasn't happened quite yet, but with so many new players who will inevitably flock to the platform, perhaps soon?