A sig deal could work
How can you be so sure? Mastercoin once did a sig campaign and the result is: https://bitcointalksearch.org/topic/m.6056946
I don't think that's really relevant here. The market for people interested in "decentralized trading of bitcoins discussion" is very small, and those sign ups don't generate direct income. The market for people interested in a bitcoin dice game is very large, and those sign ups directly generate income. I don't understand why everyone always brings up mastercoin when they talk about sig deals for bitcoin gambling sites.
Except PD, most of the casinos ever run a sig campaign discontinued it(bit777, bluevec), or turned out to be scam(bit365), I think that answers if the sig campaign really works.
Signature campaigns work IF the right members are chosen such as only senior members and above accepted, etc. And hand picking high posters and paying relatively high rates proves to be effective.
Every dice, I'm always open to run that campaign as we have discussed