I have seen his/her post about how happy he/she is because there are many people from 3rd world country who do a good job and contribution to this forum and make money from it, and the money is considered big in their country. If this system happened, then the poor will be troubled a bit if they want to join the sig campaign. It will be like a money game, one who has money will have a higher chance to be in the game.
The price should not be too expensive but enough to make it inconvenient for massive spammers, the equilibrium between the two.
The addition of merit system has prevented new accounts from being farmed so this idea is no longer urgently needed but I think it'll be somewhat effective to combat the existing one.
I think a remember seeing hilariousandco post the same thing again very recently so I don't he has dropped it. Maybe he's just a bit less vocal about it since Merit has been brought in.
I was referring to theymos.