I think you overestimate the amount of rewards that are going to the upvoters. If I upvote one of these posts, I receive maybe ~0.001 SBD. While this is extremely helpful for me as a newbie, it's a drop in the ocean of the SBD that's being rewarded for most posts. As soon as I have a couple more months on steemit under my belt, I don't think it will be worth my time to upvote these posts for 0.001 SBD, but right now, it's helping me get to the point where someone might see my posts that I spend time creating content for. These posts are basically tiny faucets to help newbies get started, not some blight on the community that are stripping rewards from content creators.
If there isn't an explicit rule prohibiting these types of posts, I don't think you should be flagging them simply because you disagree with the content. Every post that gets flagged just turns off 150 newbies from steemit.
exactli