It's not like a regular like you do on facebook or other social media platforms.
At bitcointalk.org, high merit score means that you have high posts quality, it means that you comments are really worth for some people because you got honored for them.
On those platforms (FB etc) likes are also showing meaningfulness of the post or the page. So it's the same in the start. Difference only in amount. Here if you earned 100 merits you are godlike

and on FB you need 10k+ to be like trend maker, isn't it?)
It's going to do a simple thing, high rank is going to have a direct connection with the quality post, you won't find Hero members posting comments with non-sense as it's common to see now.
why not?) what will prevent any member from posting useless post except they don't want to lose their time) the only thing could be done with it now is to make their trust negative, but it's obviously too much. I think paying merit for posting could do something, but it needs much more merits to circulate in system (may be we are moving somewhere there in long term?

)