I think the entire guild buff system needs a rework. You have to put money in your guild to 'maintain' buff towers, and then you have to pay the tower to have the game eat your gold for the buffs. Like someone said earlier, you either have to farm gold or buy gold with diamonds to get the buffs. Having at least part of the money that the player pays the tower go back into the guild wouldn't be bad as at least a partial solution to that problem, or just normalize the towers with the xp/tp/dr towers.