For me it's a bit discouraging to get 40 upvotes in the first minute I post only to realize that no one even read it! I made a suggestion recently about inline images and thought people actually liked the idea until I looked at the voters.
Yes, there will be times we'll get upvotes from humans that haven't read a post either but I think it's less likely.
@patrice That's why I only look at commentary myself. Votes are fun, but talking with people and being social is the real name of this game.