AoA Mods,
I have a humble suggestion about these spammer who create dummy accounts and post useless and irrelevant material on this forum. The suggestion is that there is a forum called www.forexfactory.com

All the initial posts of new members are hand-picked (reviewed) by the mods. Once the mods ascertain that the member is not posting irrelevant and spamming they convert the status of that member to Junior Member. And, until they become regular members they are called New Member. So reviewing some 5-10 posts would make sure that the person is not spammer.

I think that this method would increase the work load of moderators, but it would keep spammers away from the forum. And after few attempts they would leave the forum forever.

I hope you liked my suggestion