Some of this has already been said by michaelf below, but you do realize that you're getting into the education market, right? I realize there have been elements of this even from the beginning of Y Combinator, but just because a change is gradual doesn't mean it's not important.

That's not to say it's a bad move. Education is one big, slow target screaming "make money off me!" There's also a really big chance to help people at the same time, which is of course a nice overlap. But some of the dangers that make elementary schools suck, and high schools suck, and both American and foreign colleges suck will be waiting for you as well. Education has an impressive record as an institution-killer.

So be careful. We like you guys, and it would hurt to see you go down when you started out so well.