Edit
The merit system is same as Facebook like system. Here you show the OP with merits that you likes his post.
Hmm not sure if we should look at it in the same way.
1. You can like as much as you want on Facebook without limits(probably until you get hit by the spam filter).
2. You can like even the crappy posts on Facebook as long as it's hilarious or something.
3. With the merit system, you don't necessarily need to want or "like" the post, the post being high-quality might suffice(completely depending on the post itself). Probably even if you disagree with the post.
4. You can recklessly like as much as you want on Facebook but you need to be more responsible and a bit more "picky" when giving out merits.
I didn't mean it exactly like Facebook like system, I gave OP a layman overview so he can get the gist of the merit system.