Why not offer this opportunity to more advanced members? Like full/senior/hero? It would be certainly more visible that way...
At the moment I want to give the opportunity to newer members of the community, and I don't want to spend too much at the moment. Higher-ranked members can still participate, they'd just get paid Jr. Member rates, although they probably wouldn't want to because there's better offers out there.
Also, I just noticed that you have signature from another campaign. It may not look the best if you are trying to promote your own business. Someone may think that you are greedy to the point of not wanting to promote your own site but earn some additional btc somewhere else instead.