But you've gotta admit that a large chunk of the bitcointalk community is just here for the signature campaigns.
I would, yes. Whether this is a good thing for the prosperity of the community is debatable.
While I think it is fine to get paid for something you already would do - in this case wearing a signature to get paid for posting you would still do otherwise - I believe that people that post solely get paid from their signature do not benefit the forum whatsoever.