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Yep, I've already proposed to need 5 merits to become Jr Member, for it will ease the number of shitposter or bots joining bounties and spamming all over the forum.
I don't think a single merit requirement is of any significance, it's too easy to feed into an alt and bot network. I've mad a number of suggestions in the past, and some of them are.
- Newby thread starting restricted to an intro and an account recovery board. Newbies and juniors restricted to beginners and associated boards.
- Merits associated with posts deleted by a mod, or by the poster should be removed.
- No merits for trading, bounty, ICO or similar posts.
I think there were a load more, but that will do for the moment.

Yeh, we talked about something similar weeks ago, in my case the proposal was about a newbie jail in where they need some number of merits to become junior and leave the jail. Since Theymos doesn't seem to like the idea (probably because the last time it was a total failure), maybe the jail is not necessary.
Even if the jail is too much, by asking for some merits to become junior probably it will be easy to get rid of many shitposters, at least on the bounties. The issue also is that many bounties are accepting newbies, even brand new users, in their campaigns. So, in addition to the merit implementation for newbies to become junior, I would suggest that the bounties maybe should stop accepting brand new and newbies.
5 merits is a bit of effort, and if you are a "normal" user (considering normal as someone interested in grow-up in here, or at least, interest on the crypto world), you should be able to have them in less than a month. Of course, newbies in a need of merits will create a whole new specimen., the "forever newbie", in substitution of the actuals "forever juniors". So, as far as newbies can join airdrops and bounties, it doesn't have any sense, it is only going to change the name of the specimens.