I think the current system handles this fine for a couple of reasons. A big incentive to actually read posts before you vote is that you might actually learn something new. Having learned something new, this better prepares you to make a quality post of your own thereby gaining XP through the up-votes of fellow monks. The XP you gain from these good posts will add up much faster than a daily round of using up all your votes on unread posts.
Also remember that the bonus for using all your votes goes away after level 6 so that strategy will not payoff in the long run.
I think the bottom line is that most people will tire of showing up everyday to vote without reading just to gain XP. I hope that most monks will use their votes wisely on posts they read, as they would have others do to their own posts. This will get them not only XP points but experience in Perl as well. I believe the current system handles this appropriately.