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A friend and I actually brainstormed this idea for a new MUD we were starting to design. A lot of it just consisted of things we'd like to see different from Achaea.
Premise: Player housing is underuseful and underused. People don't have a reason to visit on a regular basis.
Currently the mail is delivered by birds (midgets for Mhaldor), which is convenient because it guarantees it will get to you as long as you're out in the open.
Change #1: Deliver mail to the post office by default, where a player must CLAIM MAIL for 50-100gp. Players will be notified of new post office deliveries by message or a messenger boy that makes the same appearance as the birds would have.
Change #2: Players can opt for air delivery (identical to before) for either a yearly fee or by tipping their owl delivery bird per parcel. (Yeh I drew from HP for that one.)
Change #3: Players can purchase a mailbox/letterbox on their plot or inside, which makes mail free to receive at that box. (keyword: mailroom, 1 room credit)
I like my steak like I like my Magic cards: mythic rare.