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You have zero knowledge of marketing & Bitcointalk traffic. Even if you spent 10k USD week, you will get zero customers from here. (Our friends promoted their business, so we know the reality)
Do you mean that your friends promoted their business here? and they still got no traffic for their promotions here?
If so, what kind of promotions or marketing they did here?
As what I have observed here for a long time that I'm here in Bitcointalk, signature campaigns seems very helpful for advertising one's company.
It's really working as long as the campaign is well managed, together with the participants and their posts.
Surely, the result will depend on how you managed the promotion.