BTW, I wonder if the merit will reduce when give to other people
First reply, explanation for those that cant be bothered to read and understand the full OP.
You have Merits, those you cannot send.
You also have sMerits, those you can only send, they have no other purpose.
When someone gives Merit to you they lose sMerit of the amount transfered and you gain Merit as well as sMerit (which in case you can send again).
Example: Should I send 10 Merit to you for a post, my sMerit would decrease by 10.
Your Merit would increase by 10 and your sMerit would increase by 5.
Merits are exclusively earned, but the sMerit part you also get keeps the circulation flowing.
(Ignoring merit sources here, for the sake of making an easy example.)
Is it allowed to ask for Merits?
For example, I created a long post which I think is of quality and then at the end of my post I say please merit me if you think I am helpful etc. etc... Just like a youtuber asking for likes & subscribers at the end of their video.
This would likely decrease your chances to get merit.
Similar to how it is currently allowed to ask for trust, but people generally frown upon it, and many dont leave trust if asked for.