This topic explain's stuff about the Guild bank.
Well, i maked the guild bank with two reasons, 1. For raiding stuff like potions and stuff, (but for our loyal players that aren't 70 there will be random stuff in it, like armor pieces for low levels). 2. And for our players that has a proffesion and want to expend it. There will be mats in it, as example i will put some arcane dust or something like that in it so enchanters can train their skill.
Maybe you have seen it, but i put sometimes money in the guild bank, that isn't only for players that are broke and need repairs. BUT! that money is also to finance our raids (as soon as possible i will set up a karazhan raid group) and to buy the mats that we're putting in the mats tab.
And the last thing i want to say is: If you can use the "guild repairs" button, only use it when you really need the repairs, i mean if you're almost broke.