In an ideal world, yes. Everyone would check the new posts and upvote the good ones. But not many are doing that, it seems the flavour of the day is increasing rewards for oneself. But all the rewards earned will be worthless unless steem carries on growing.
So for now, giving some plankton votes to encourage them to continue participating is a worthy goal and as an investor in the platform, I want to see more users stay and even make enough to feel so excited, they tell their friends. That's how social media platforms grow.
This initiative isn't mutually exclusive to finding and curating content manually. I am still doing both