Ok, I accept that merit sources need to work like that to remain a merit source, can't theymos do it with normal users too who demand some sMerits?
Theymos occasionally promotes normal users to the status of merit source, though you'll need to do more than "demand some sMerits" to be worthy of consideration.
Though I'm unable to give too much time to the forum, not bragging about myself but I guess I'm doing enough in what I'm contributing in order to get some merits and be able to get sMerits to send to others, but to me, merits is now totally luck-based when we consider a person like Vadi2323 involved as a merit source.
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The 1:1 ratio you mention would create thousands of sMerit circle-jerks, even simply between 2 forum profiles, defeating the whole purpose.
Why would that be bad? Instead, there will then be many bans if such merit abuses will take place and that will be specifically for those jerks who will try to do it. But yeah, on other hand, that may be bad for the forum as merit farmers (who will do it after this gets approved) will be able to sell more merits through this (I never thought about that).
but to me, merits is now totally luck-based
It really shouldn't be. Earning merit, actually, is really easy. I earned a substantial amount of merit in the last few weeks by just writing some informational replies and creating threads on the Newbies section for Local (Turkish) board. Although it may not seem like it, a lot of people do pay attention to what you are sharing, writing.
Why would that be bad? Instead, there will then be many bans if such merit abuses will take place
This requires a lot of human intervention. Mods are humans. Not robots.