I wanted to register an army of socks to register for sig campaigns!
looking in the mitchett topic i find few opportunities to join signatures campaigns, the old ones are full, the opened one offers a little amount with many restrictions, yobit that accepts everyone is full too

don't see why people would create new account or buy them to join sig/camp nowadays?
in the other hand prohibiting sigcamp would have a dramatic effect in btctalk imo, would say a fall of 30-50% of posts in the short-medium term and the worst scenario another forum(s) could take the lead in long term (hard but possible)
As i checked last time there are right now probaly like atleast 50 free spots or something and with time there are new ones opening up.
Older accounts/higher rankings earn more money - that is why sig campaigns are so attractive for account farmers.
About the size of payment:
It is like nothing to us in western industry nations but in nations like india and similiar which have 1$ or less daily wage it should be a lot.