Buying ad on the forums is still better than a signature. And they do not need to manage anything.
I disagree. The cost of getting a bunch of Hero/Sr signatures plastered all over the Bitcoin forum with a bunch of shitposters who will spam is about .0225 per person per week (they will post a lot for such an amount). In equivalence of the cheapest ad spot that was auctioned (1.2 BTC), 53 participants can participate in this campaign. 53 participants at 30 posts a week means that you'll see 1590 posts across the forum, most likely in the crappiest but high-density viewing spots.
We'll be looking at Bitcoin Discussion, Economics [Speculation], Gambling [+ discussion], Altcoin sections. Since shitposters will continue to litter amongst one another they will also continue to participate in these places and you'll see that demographic exposed to your ads as well.
It seems more efficient to simply create shitty campaigns and hire low-brow participants to spread your product in their waste.
You could probably even get by with .015 pp / week, making it 80 participants for the same price as the cheapest slot.