1) Making a fixed campaign with 0.2 per month for 5 best quality posters, min requirement only 20 posts , so something like 0.01 per post.
I think that not a good idea, better you reqruit more people with low rate maybe 0.0007/post like bitmixer
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What I meant is it is better than spending huge amounts for banner advertising on bitcointalk.
but you did not know how many person look your signature adsens and you can't ceck impression , unique click, etc.