<<What sort of requirements do you see as being necessary to carry the titles?
Unfortunately I don't know nearly enough about game mechanics to answer this question, so what follows should be taken with a grain of salt:
I'm going on the assumption that the amount of rumours one hears cannot be determined by the game. If they can, just base it on number of rumours heard. If not, perhaps a mild circle requirement? 10th for the first, 20th for the second, etc.? I would assume a Trader or Bard of 10th circle has at least dabbled with the system. Or instead, perhaps the requirement could be submitting a rumour? Again, if this sort of thing could be tracked. If there is no way of tracking submitted or heard rumours, I say stick with a circle requirement. Even IF a character has never asked an NPC for a rumour I (personally) believe it is in the nature of these guilds to be constantly listening to the bits of information fluttering from ear to ear.
Say, for example, Quidnunc is 10th circle. It is assumed a 10th circle character has heard X numer of rumours in their travels. The next step up, Gossip, requires 20th circle, where they have no doubt heard more juicy tidbits than a 10th circle character would have, and so on.
Just my toughts,
-C
