I have been serving as a merit source for more than years I think.
Say what? You registered on the forum after the merit system was created, so it would have been a while before you would have even been a candidate to be one (unless Theymos chose you specifically to distribute merits on a local board). I'm not criticizing you here, just breaking your balls a little--and there may be a language barrier, too. Do you know in what year you were tapped to be a source? I know for me it was 2019, and September was the month if I'm not mistaken, because that's when Theymos added a bunch of new ones.
I really don’t think it’s my duty to follow everything on this forum and reward all possible posts because it’s just not possible or realistic.
It's not your duty to do that at all, and I agree that it'd be next to impossible to even try to spread merits around on all the different sections. I've got so many of them blocked that I only post in about 5-6 sections total I think. Maybe more than that, but compared to how many sections exist on this forum, it's a very small percentage.
And by the way, most of the members who've made my ignore list have been ones who've consistently posted garbage in sections like Bitcoin/Altcoin Discussion and sometimes Economics. Those first two sections are like a swamp of shitposts, even though I think Bitcoin Discussion has improved in the last two years or so. Not sure about the altcoin section, as I don't visit it anymore.