Pay per use doesn't fit. If we were going to have something that you just dropped an arbitrary amount of gold on to get a buff, we'd do that instead of making it part of the Governorships. I can see allowing individuals choose the buff they get, but charging the individual just doesn't fit. The city's treasury is meant to be something that can serve as a rally point for encouraging play. What method of play is employed in order to facilitate the raising of those funds is entirely up to those participating. Making it just a pay per use does not encourage the community that Governorship's are intended to foster. I understand that some people like to play away from larger groups, or maybe aren't able to be online the same time as their friends in some cases. As a result the upcoming trade orders are geared towards being to play something by yourself (smaller ambush style encounters that you can solo while delivering the order), whilst still providing for the community at large (there are big payouts to the city stones for deliveries). Those are the types of solutions that provide another menu item on the buffet of activities in Britannia, rather than just dumping gold somewhere.
We can look into putting the old style bulletin boards somewhere near the offices. These would have to be placed manually so it'd be on a requested basis.