I notice the sudden interest of newbie/jnr members wanting to join signature campaigns, starting thread on this board in the past few weeks. I recommend you read this post Signature Campaign Guidelines (read this before starting or joining a campaign) and in addition to the above topic I'll list some factors you should consider before joining a paid signature campaign irrespective of your rank because the signature you wear speak alot about you on forum.
[1]: Build your account before joining a campaign.
I consider this as the most important factor to consider before joining a campaign. If you haven't built your account don't go joining a campaign because it'll only distract you. It's more benefiting to join paid campaigns as Full member but joining as a self made member isn't that bad also. Take your time to built your account, there'll be more campaign in the future. Don't be in a rush to earn via forum.
[2]: Join a campaign you agree with and not just for the payout.
If you're the type that dislike gambling or have no idea on how it works, don't go joining a gamble campaign just because they pay better. It will lead you to spamming and most times posting off topic.
View this as an example.
The user in question is promoting/wearing a gamble related signature but advising others through his reply not to gamble, isn't that contradicting what he's advertising. Join a campaign you agree with don't join just because of payouts.
[3]: Consider Weekly maximum post required.
Avoid campaigns that requires high number of maximum posts weekly, such campaigns does the forum no good and only encourages spamming. Evaluate your posting skills and from your post history determine what your average weekly post is, don't just up into any campaign that'll end you up with rapid increase of post counts without adding value to the forum.
[4]: Join a campaign that encourages quality posting:
Consider the bitcoin you get paid as a monetary reward for your quality posting on the forum so as merit is also a reward. The campaign you join opens doors for more benefits on the forum then just earning bitcoin, there are some special campaign managers that if you get accepted into the campaigns they're managing, you can consider yourself as a reputed or quality poster on forum, that should be the type of campaign you should strive to join as such campaign encourages quality posting and I'll help build your reputation as a quality poster on forum.
[5]: Consider boards post count are accepted in.
I notice many forum users joins signature campaign without considering the boards they're most active in. I recommend you join a signature campaign based on the boards you're active in, currently I won't join a campaign that doesn't consider Beginner and help board as an acceptable baord for post count. Reason been that that's the board I'm most active and familiar with and enjoying answering questions ask and assisting newbie on the board. Lets say there's a campaign focus on accepting participants only posting on Development & Technical Discussion baord I won't apply for such campaign since I'm not that familiar with the board and most of my post would be considering off topic as I'll be struggling to meet my post count which might lead to spamming the board and might end up getting ban or removed from campaign.
[6] Know the project well before advertising.
Before you apply to promote any project through signature campaign, carryout some background check on the forum and google too, make sure that project is legitimate and has no past record of scam or it's a scam. Advertising scam project through signature could lead to your account recieving Red tag.
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Guidelines: Guide on avoid red tags by supporting already known scam projects
[7]: Consider the reputation of campaign manager before applying.
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Reputed CM: Overview of Bitcointalk Signature Anti-Spam Campaign Managers
[8]:Verify fund available and address ownership through sig message
Before joining a signature campaign always verify if the campaign manager has the available fund to pay participants for the week. You can do this by searching the bitcoin address posted by CM on https://www.blockchain.com and if you're in doubt of address ownership you can request for a sig message to prove he/she has control over the private key of that address.
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[9]: Consider the payout option before applying.
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But remember that sometimes, you need to shoulder the fees if you're going to withdrawal it. So if the campaigns say, they're going to pay you .01 BTC, then expect less because of the withdrawal fees. Not unless the campaign manager can work out with the gambling operators that the fees will be shoulder by the company.
[10]: Read the rules of participation in the campaign:
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In addition, I think campaign managers have these unwritten gentleman’s rule about joining one campaign to another campaign. They can skip people who have a signature campaign already as a sign of respect to its campaign manager.
In as much as you participate in a paid signature campaign on forum, you shouldn't forget the main reason forum was created and always try your best to add value to the forum irrespective of what you're doing as you stay on forum.
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This topic is open to more suggestion from you guys and I'll update thread as better suggestion are mentioned.