To earn a little money from doing jobs here 
What kinds of jobs?
why?, sig campaign work well as a side, job, whne you finish your real life job, you can earn soemthing extra in a total relax in front of your computer
his earning is a bit of a joke because he is still jr member, but the point stand
You are right, people here are making good amount of Bitcoins doing signature campaign "jobs" for which they are rewarded...
Many are living on Bitcoins including me, and I also work here, try to help everyone a bit and that's the magic of this forum why everyone's here...
Helping and earning on the same platform...
If your treating it like a job your doing it wrong. Also if it is the reason your own the forum your doing it wrong. I don't see signature campaigns being for those people, even though there are a few.
I think it works best for those who do their normal posting, and it's a bonus. If you do it this way it prevents signature spam, and a lot of problems.