I was on another forum for earning money and there were also some signature campaigns but the earning was lower that what from this forum. But the best source of earning is to start your own site or start any online service.
Bitcointalk is the best bitcoin forum especially if you want to earn at the same time you can learn/contribute in this forum unlike the other forum the earning is so small and its not mobile friendly.
Yes and this forum allows you to earn in multiple ways depending on your skills and I don't think that any other forum will provide you all this opportunities of earning bitcoins and this forum is also an best place to collect latest information related to bitcoins and other altcoins.