* Number of participants
*The rank of participants
*Length of the campaign
*Payment structure for different ranks
um, I don't understand what you are explaining here, no one knows how long a campaign will run, not even bounty managers, on average bounty managers always state that at the beginning of the campaign topics they handle.
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Like you pointed out in number 2, it's important to join a campaign that you agree with their business ideology, not just for their payout. Or at least try and learn more about them before joining, so there'll be a synergy between you and their kind of business. Personally I'm not into gambling, but sometimes going into the gambling boards and reading comments have made me to understand about it, now I can join in interesting discussions there. So I can now safely apply in a campaign that requires post counts in gambling, not because of their payouts but because I'm now comfortable posting in that section.
if you don't like mixers why do you join the mixer signature campaign and if you don't like gambling why do you join the gambling signature campaign, this is a funny thing that appears quite often on forums lol, you can't just want payment money from a campaign but not supporting their platform, that's unethical.