Came here to object on the effectiveness of sig. marketing. Well... at least partially. I'd agree that half assed sig camp is basically a money waste, with low ranked members sprouting nonsenses and low quality posts. But at the right hand, sig. can actually boost credibility of a project. When I saw people with high merit numbers, or great quality post, or trusted, or on a top rank, it usually attract me to know more, because I think, these people will certainly investigated the project before enrolling to their marketing campaign, because the least they want will be to be associated with lame project. Thus, they'll be extra careful on selecting campaign. And thus, the project will be more likely to be a great project.
Yes, this is true. I will soon open a bounty campaign here on Bitcointalk and there will be a signature campaign as well. By the way, do you know anyone who could create a signature for use ( a very simple one, mainly directing to the website and whitepaper) in exchange for GBTS?
Unfortunately no, I don't know anyone specific, although I stumbled upon one or two announcing they're a sig designer. I can reach them to drop you a PM, but I think your chance and option will be better and wider if you look for some on service sub.