But I think you confuse value with effort. Maybe it takes me an hour to write a post and you it takes only 10 minutes. That's not a sign that my post is inherently more valuable than yours.

And just because you think something is a cheap post, it may be the right thing at the right time for someone else. What your post makes me think though is that there should be two kinds of default upvotes: up-vote for money and rep, and up-vote just for rep (a 0% up-vote).

However, that does not solve the abuse problem, it just allows more fine-tuning of voting.