In addition to what you re-echoed statement, I just want to point out that signature campaign is sometimes just useless if users participating on it doesnt provide good post spread in the forum to target more users that is not aware to the promoted casino. Most of the campaigns focus on gambling board alone while most of the user visiting this board is not all an active gambler and just posting for campaigns.
Theres still a lot of potential customer out there on Bitcoin and Altcoin discussion section since some risky traders are gamblers too.
I don't think long signature campaign are anything but effective. If this were the case, then really large, reputable casinos would not have been running such campaigns for several years continuously. And not only traders perceive this advertisement in the corresponding section of our forum. Also, I think there is an influx of new users to the forum itself. And some of them learn about the casino from this form of advertising and promotion. And even if there are not too many such new players,
I think that it is still profitable for large casinos to advertise themselves here in BTT in this way.