I do not understand these people, what is the logic of giving Merit to a person who has more and more)
Honestly, I don't get that either. Giving merits to Theymos or Satoshi is just like wasting them, even if the posts are fantastic. sMerits have a utility other than rewarding good posts (it allows people to rank up), and I think people either forget that or don't care.
I've merited theymos many times, but always for posts that I think more people should read. I wouldn't send 50 at once though.