Avion, I just reming you that I'm greatly favorable to recurring costs. They are the _only_ way to make a working economy, since money get generated by mosnters it _must_ be destroyed by something other. IMO we should just make the guild cost 100K each season! So a non working guild will simply close (solving part of the problem of limited number of guilds). And this cut the head tot he problem that guild is not any more too mcuh expensive.. you have time to earn that money.
This open up the possbilities that having a guild become a buisness, like it should be, and a hero can think opening a guild not only for fame but for earning money, what subscibers get? The items that are inside the guild they can use for free (like was in Neocorn) but this require that weapon requirments got activated so a player can use only the most up to date armour/weapon based on his level and not simply he goes in the guild take the most powerful things and then don't renew his subscription (in the end he allredy taken everything he wanted that probably worth much more than his subscription fee).
When you open a guild you have to choose the type of it, like: mage,dragon,warior,artificer(creates every sort of items).
Then inside each of those guild you get a special thing, for example:
In mage guild the guildmaster can with a quest (a really hard quest, not like those that are there just now, a level 60-110 quest, or a level 330 quest [3 110 level players]) create permanet spellbook where subscibers can learn spells, each permanent spellbook requires a different quest (maybe not all spellbook possible), and level needed to learn from permaent spellbook is like triple (or simply the rigth one if spell level get fixed... not "destruction" level 18 anymore..). And a 10000 mana crystal can go in that guild too.
[funny idea: to get meteor swarm spell you have to kill hanuk family all at once: mother, father, sister, brother, and small brother that cast directors at random as hell (he is a kid in the end

). Yes, you thinking rigth those quests _must_ be simply impossible, in the end it's a permanet meteor swarm spellbook. And those permanet enchancemnt of your guild need to be mantained, yes, they make your guild mantain expenses highter, that's for the energy you have to buy to mantain the books working and in good state.
For artificer guild you can put creation containers with a highter bonus, like cauldron +5, then you make a cumulative quest and it become +6 then +7 and no more, those for all the different creatin containers.
Those guilds will help the bigworld map to fill up a bit, since they create many "quests", in the sense they are quests and are usefull, but at least save the mapper form finding a decent story back to it and they can be auto-conclusing.
You have to notice that those, group of quest form a suit of "guild quests" spread all around the bigworld map that one must go around and look for. And noticing the size of Bigworld map remembering where all those are will not be easy.
Another note is that since guild number is limited, it is not needed that those quests reset often, making them just very rare, we can make them reset 1 time season, or resetting in the normal way but only beeing open for only one season. Like Hanouk family goes to nap during winter and is avaiable only during that season, since the rest of the time they are around the world or the "outher planes" (not reachable).
Ok writing this long post I forgot some ideas I had during the writing

Lol, for those that read this: dont' worry! Such ideas hassle my mind constantly..