the sources of merit must still give merit to everyone, whether they are quality posts or low-quality posts.
No, who said so? Merit sources must not give merit to everyone, including those making low-quality posts. See what theymos said about it:
While we will not be directly moderating this, I encourage people to give merit to posts that are objectively high-quality, not just posts that you agree with.
And:
I'm hoping that this system will increase post quality by:
- Forcing people to post high-quality stuff in order to rank up. If you just post garbage, you will never get even 1 merit point, and you will therefore never be able to put links in your signature, etc.
I also remember theymos saying that when a person finds a user who is at least writing good quality posts and they need a push to rank up, they should give them more merit instead of 1 or 2 so that they can rank up if they deserve it, but he never said that merit sources or normal users should merit low-quality posts only to exhaust their smerit stash. What will be the point of the system if low-quality posts are also merited, allowing undeserving users to rank up when the system was introduced to stop them from ranking up because they don't contribute anything towards the forum's well-being?