I now think it won't really resolve the problem but rather create new ones. And it will be worst. I can imagine another type of "campaigns" coming from behind the scene of the forum, and you can imagine the result here...

@Carlston Bank

Yes, I have a signature but as I posted, even if I didn't, my opinion would be the same.
When you're in a community you have to think about others, it's how a community works. You surely forgot my question, but what about if your friends are now asking you some money to talk with. (I know you can say, Bitcointalk users are not your friends but you get my point)

How can it be good to ask people money to share their opinions with others, or someone trying to learn, etc? Bitcoin is not a private club and the forum either...

Your solution is rude and not really friendly. This said I would pay if I have no choice but would consider the forum as not so friendly and a kind of "private club" which isn't what I am looking for.

Paying a membership to be allowed to have a signature is something I would have no problem with. I used to pay xxx$ per year in some forums to have access to either some sections or to be allowed to open some topics related to sales.

Theymos is apparently thinking it isn't a good idea, but believe it or not, there are a lot of people who will have no problem to pay for something like this.  

I aslo wonder what do you think would be the criteria to estimate the price to post here