Yeah it's a tough one. The +1 point is there to try and encourage people to vote for good answers.
But I can see your thought, if someone upvotes every single post might get a few thousand points. But then voting on all those posts takes a looooooong time and isn't worth it.
And remember, the person who made the post gets more points from the upvote, so if you vote on every post everyone else will still have more points.
If I get rid of the +1 for voting up, most people would lose 500-1000 points. I guess this isn't a huge amount for the people over 10,000. Feel free to comment if you think I should change it.