There are things in the game one has to discover by himself - not everything can be written down for you.
I have to say that this is not at all helpful. This aspect is not something that one should have to 'discover'. A guild members should be able to know exactly what the guild money will provide, not have to guess.
I look forward to seeing this addressed in FAQ.
BTW, the FAQ should probably be made 'sticky', since this may become a valuable resource.