Briefly, what exactly is a signature campaign?
Not sure how that works, looks like you sell your user reputation here by allowing
ads to be posted at the bottom of your forum comments?

I have some miners, I know how that works. 2 x Terraminer IV's running about
3-3.2 TH/s constantly over the course of the past year + 367 days has yielded around 32BTC.
Power is about 1850W each, so 3700W for the pair. Figure what you pay for that, plus
whatever you pay for internets. I think I calc'd  BTC needs to hit about $1500 or so USD in order
for me to break even.
On the other hand, its a certain amount of entertainment and does my part to help the cause.