I suppose it comes down to the thought process. You have immense influence with the steem power you have and you seem to take it seriously. You put thought into your posts, comments, and votes. You consider the effect of your actions and from what I can tell you act in the best interest of the community as whole. An extra .001 steem power doesnt mean anything to you, for the people out there who are just here to make a buck even .001 for an early upvote is better than nothing. Like you said though, it makes more sense to point out a possible fake and hope to be rewarded for it but the majority of people probably aren't putting as much thought into each vote as the big guys are.