Better handling. Changing the rake of the forks will set the bike up for different behavior coming into, going through, or exiting a corner. Normally, the more steep the rake (fewer degrees), the more "twitchy" the bike feels.. It'll make it turn in much easier, but mid-corner stability will be sacrificed (IIRC.. grabbing info from a few years back, spooph should be able to correct though).
X has his bike dropped for better aerodynamics. Blackout is trying to make his bike handle the corners better (I'm assuming here

).
I accomplished something similar by installing a set of Woodcrafts and lowering the front of the bike by about an inch. I didn't notice much of a difference, but picking the back of the bike up a bit would do the same thing.
If you rack the back of the bike up too much, the bike will start to lift the tail under acceleration. As bikes work now, when you accelerate, the back end tries to squat from weight transfer, but the way the swingarm works counteracts the squat. Some bikes jack, some squat, some stay neutral. Lifting the back would introduce a more pronounced swingarm angle, and allow jacking more readily. Now, with all that said, the 250 doesn't have the power of something hellaciously torquey, like a big Harley or a Buell, so you may not see any ill-effects as far as raising the back of the bike.
Blackout: Sorry for a threadjack, but figured I could help Delta and hi-tech out a bit within your thread.