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And lower ranked forum members can take part in the Bitcoin Scratchticket signature deal with referral links. You don't get much but it's better than nothing.
I wouldn't really recommend it. The 25 posts per week are hard to make without spamming. Especially if you're not interested in each and every aspect covered on these forums to make meaningful posts there.
Yes, I acknowledge there are users that easily make more than that in a week without spamming, but those mostly run a service or a project or are actively trading via the forums which in itself leads to quite the number of posts.
That is why I stopped taking part in it myself. I know a bit about mining and have a question here and there, and try to help out where it makes sense. And sometimes there's just interesting stuff in the "Politics and Society" section. But that isn't enough to make 25 non-spam posts per week.
The 50 per month are much more relaxed.
Generally I agree that it is benefiting the forum if only members + are eligible for the majority of the campaigns. What no one has mentioned before: allowing newbie and jr accounts also opens the door too wide to multiaccing. Let's not be naive: People are after a quick penny and some will take any possible route to make as much as possible as quick as possible.