Much like Metal Gear Solid 4, Sony is looking for LittleBigPlanet to move consoles from the shelves because all types of gamers are going to want this title. Personally, the desire to want and the stronger feeling of need are two separate problems; everyone will want the game but many will need to buy a PlayStation 3 for MSRP.
Although the prices are slowly dropping for a PS3 unit, hardcore gamers are the ones that will rush out and spend a bundle of money for a console just to play one game. If not hardcore gamers, fans of the franchise (MGS4 for example) and LittleBigPlanet is still working on building a fan base for their new franchise.
The platformer LittleBigPlanet, for many, isn’t worth $399 plus the price of the game. That’s asking a lot, but Sony still thinks it can happen:
It’s going to be a hardware seller. Not only do you have the platforming experience that a lot of other games will have, you have this creativity that really is exclusive to LittleBigPlanet. (kotaku)
Would you run out and get a PS3 for LittleBigPlanet? I’m tempted, but that $399 barrier is truly a large obstacle to clear.

An expert has given testimony to the US House of Representatives Subcomittee on Commerce, Manufacturing, and Trade during its commencement on hearings on the “unauthorized intrusion” on Sony’s PlayStation Network and Qrocity service, stating Sony knew that their security software was dated and lacked any sort of firewall against hacking.
The anonymous source is running around with a bunch of neat rumors, such as a LittleBigPlanet release on the PSP but the one that may hit home most with gamers is price cutting. The PS3 has been around for a few years now and hasn’t budged on the price tag; they’ve had fire sales on obsolete products (smaller disk drives mainly) but no official drops.
It makes sense for Sony to try to push themselves away from being classified with the Wii console because it makes them look bad. We’re all equal gamers here, there is no need to break into more sub-categories when only three consoles vying for top spot. Many folks (including us) criticize the slow adoption rate of Wii games, yet they steal top software sales spots as well.