And there's this:
I think that tagging may be appropriate in particularly obvious cases, or particularly egregious cases involving hundreds of merit points and several posts. But generally you should start out by assuming good faith, and only change that opinion as the evidence really piles up.
This isn't easy So I guess the question is whether proven alts sending merits to each other is a "particularly obvious case"... of what exactly? Looks like 36:0 so far the consensus is that merit-to-alts is not ok.
And there's this:
Merit sales, transfers to aliases, back-and-forth trading, etc. are not much of an issue. All illegitimate merit will decay, and will account for a tiny and very expensive fraction of the total merit economy. It's basically a rounding error; fight it where convenient, but waste no sleep over it.