Though I like the spirit behind this idea, I don't think it's necessary and I'm not sure it would help.
Given enough time--and merit sources awarding merit to good users, ones who aren't merit farmers--this problem should take care of itself. The merits sent back and forth between alt accounts of idiots & merit dealers should eventually run out, leaving them and the forum as a whole with less over time.
Aside from that, I'm pretty sure that when Theymos rolled out the merit system in January, it was pretty well-thought out and he's probably not going to be tweaking it anytime soon. We're still early on with this feature, so the verdict isn't in whether it's a failure or not. So far it doesn't seem to have caused a pullback on shitposts (I continue to see a lot of them), but users who make them don't seem to be earning much merit and hence they won't rank up. That removes a lot of the financial incentive for them to continue to make them. Right now, that's good enough for me.
Dude, they don't care.
I pointed somewhere that bunch of junior member (alt)accounts earned $100K(no, I didn't make mistake, one hundred thousand dollars) for a month of posting cheating only 1(yes, one) bounty campaign.
I would not call them idiots, whoever can make 100,000$ in a month is definitely not an idiot.
Let me put it this way: Someone pays good member 300$ for 30 days promotion. Idiot is payed...50000$ for a month for signature.
So, third world shitposter earned 50000$ in a month, and first world great poster has earned...300$.
You are good person, but you are naive. Don't get me wrong, please.