Interesting question. I think it depends on how we broke up. If it was mutual then I don't think I'd care one way or another. Then again, I'm not much of a Facebook troll either so I might not even know I was blocked.
If I broke up with you, probably the same thing. If I drop you, why would I care what you're doing with your life. I don't want any parts of it. Poof. Be gone.
Where this might matter to some guys (read: some, not particularly me) is if you broke up with me, and I still want you. Then I might be inclined to want to know everything that's going on in your life so I could figure out what you're doing or if you're trying to move on.
Sexist Statement: I really think that Facebook stalking post-breakup is more a chick thing. I could be totally wrong about this, but I can't see a dude really just lurking on your page hoping to get some insight that you'll take him back. No men are more aggressive and insane with it. We'll just stalk you in real life. Men are nuts.
Assuming we're dealing with a slightly insane fellow, I'd think that blocking the page might drive him more crazy. Because then he has NO access to you (without stalking) and heaven knows what you could be putting out there. He might try to get to your page from any locale possible. So that would be my suggestion. Just block him and keep it moving.
Again, somebody like me wouldn't care. But an insane dude...yeah, he'd go nuts.