It all depends on what you decide as a guild will be acceptable. First no matter how rich or powerful a guild is, it has to work to maintain the amount of goods etc. needed to sustain their effort in GBG. If you want to get anything out of GBG you need to do the same. All but one of the guilds I am in are small. In those we do GBG on a casual footing And have found which level suits us for the moment. It is a balancing act. We do enough to keep us in Gold, but ease off if it looks like we might get promoted. As we get stronger we will up our expectation. But only when everyone feels happy to do so.