The type of educated person who wants extra income, of course. People from third world countries are actually making good money out of signature campaigns. I think the value of signature campaign depends on the cost of living in your country. Those people who can earn enough money to keep themselves fed would value signature campaigns and those people who can't even buy a single meal out of signature campaign will surely not work hard to reach the maximum post.
Given 3rd world peasants make like $100 per month that's not saying much, mate. I'm in North Korea so I can feed my 8 kids off that but I wanna make some real scratch (>$1,000/ month] off this gig so I can do my own Korxit, if I give up all my posting talents. So what's the highest paying sig campaign? Thx.
The highest paying campaign for now is the jetwin signature campaign where you can earn almost 0.12 btc per month or approximately less than 85$ a month for full member rank. For your member rank you can't join that campaign,at 69 activity the best campaign for you now is yobit which gives 0.0013 daily or 0.039 monthly, still not enough to feed your family for the whole month so better to find some other ways to earn.