What are the factors that we need to consider in joining this kind of business campaign?
We must know their mission and vision and we must read carefully their instruction before joining campaigns. Sometimes those who don't understand the rules, they just remove by the manager of that campaigns. We must also know their policy to avoid those mistakes.
As of you now before you have done reading to their mission and vision maybe you are in the 5 pages replies on your dropping application.
For me, if there is a campaign that holding and managed by a reputable manager like yahoo I don't hesitate my self to drop my application quickly because I know some of the members here in the forum are thirsty with a signature campaign.
If a good reputable manager who manages a campaign he knows everything about it he never risks his reputation just to manage a scam project.