From your table, the monthly salary last from $180 to $500 (from the 29th to 1st positions).
I don't think that people can earn too much money in the forum like this as their full time job.
In average, for my rank (Full Member), the rate of btc campaigns ranged from 0.0012 BTC 0.012 BTC or just higher a little bit. $50 or $75 in some campaigns with bonuses for top merited participants.
Maybe, as their full time jobs, they do same jobs the same time, from signature campaign, to graphic designs, signature designs, Escrow service, as well as campaign managements, but I think that they have to work so intensively to hit such total monthly income.
It's a really hard work.
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I never said that finding a well-paid campaign is easy but it is possible.
The rates for Members and Full Members are (as you know) not so high but you wrote that in this position you can find a campaign which pays $ 50- $ 75 - when you multiply it for 4 weeks, you reach $ 200 - $ 300 or more than the last ten places from the list I have shown.
Being Sr. With a Memo or Hero you are able to hit an even better $ campaign let's say 75- $ 100 , which means that the potential earnings per month increase to $ 300- $ 400, which means more than 20 bottom places in the table. I am not even talk about the best campaign here, where it gets very difficult to get (but still possible) where you can earn more than in each country I have presented.
Remember also that these calculations were made at the rate of bitcoin at the level of $ 4000 and as you know for a long time it was much higher which means that these payments could also be doubled or even tripled (I'm not talking about the extremely high btc rate in early 2018 when they were up to 5 times higher).
Once again, it is not easy to find a well-paid campaign, but this forum gives people from many countries the opportunity to earn monthly equal or even higher than average wages in their countries, and it still does not take 8 hours a day. If you add other bounty campaigns like Facebook, Twitter and so on to signature campaign (although today it is a very very risky source of income) some people can really treat this forum as a source of income sometimes even better and easier than "real" full-time job in their country.
I think in most developed, or for that matter, developing countries, it would not be possible to earn from this forum enough to make a living. For that, and I'm talking if you only use signature campaigns, you'd have to spam, which risks you getting banned.
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Signature campaigns NEVER FORCE you to spam! It is always your decision what you post. If you can not write posts that are constructive, meaningful, interesting or at least you should not start the signature campaign - because it is not for you.
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Now that I graduated college with a mindset and will for post-graduate studies, I use the a portion of my bitcoins to purchase books (these books are expensive as hell!) to at least support and mitigate the expenses so my other brothers do not experience what I had experience before while growing up.
I can say at least that this forum not only helped me individually but indirectly helped my family. This may sound exaggerated but without this forum and the convenience of working online, I guess my dream of pursuing my career as a future lawyer would not materialized and be just a goal that would be impossible to reach for the time being.
this is probably the best example of proper use of earnings from this forum