That's the problem Jax, I don't know myself, but some sort of mechanism in which the whole CWBP mapping project might be a game in itself to encourage participation and make it fun. This might take the form of a ladder of people who have produced maps for the CWBP by number or quality of maps. It might be to give members of the guild 'ownership' - e.g. King of Groam, of cities or states who can then issue commissions to the guild to map various parts of their country or city...don't know what the payment would be. Stuff like that really.