A 4th guild hall? Yep basicly what I see in this new 4th guild hall would be simply the ability to check and sell things from a cs charter in your new 4th guild hall.

Now how would this make 4 better? Well let's see what you get when you enter cs /beggers/spammers
(AND I MEAN A LOT OF SPAMMERS)/scammers/ and just straight up rude people just being rude to others (which is where I would come in and troll them but that's another topic for another time.) So as you can see with guild halls 4 with a cs charter you could check your items sell them and even go afk wile you wait for items to sell or just avoid all the trouble of cs all together.

Or if your and officer like me just chilling in guild hall you could have other things to do other then watching guild chats and stashing potions. You could even have sales in your gh to members of your guild.