It is up to stakeholders to decide how to to vote.

If you don't think this is a good use of rewards, I would encourage you to downvote.

Personally I think the burden is on posters to create content which is compelling in its ability to add value to Steem. There is some of that, but also a lot that does not. That's just my own personal view though. Every stakeholder voter can decide for him- or her-self what is best.

The part about curation isn't really true though, because a lot of the votes are before 5 minutes (I see a lot at one minute) so curation gets returned to the pool. The percentage is much lower than 50%.