I`m quite serious.
Wasn`t it nice to have your own castle in Might and Magic ?
And it was a part of main quest too (in a superficial way, but - hey, banner colours in the main hall depended on it

)
Beeing a part of a specific town community could be a part of some quite complex quests and game intrigue.
I mean - REAL quests and intrigue.
Not another - "kill 10 x ____" or "check if my brother`s alive" or "save the country" - dull, repetitive pseudo-quests, excuse for grinding.
A whole alternative ending, perhaps ?
Ofcourse - RPG heroes always follow the fading sun, and never settle. Blah ;p
It could be a way to spend piles of gold. Or to keep gold ? Couse, you know, 200000 RPG gold pieces weights nothing, pseudo-medieval shopkeepers usually just check heroes visa.
Another suggestion form M&M series - banks! Interest rates! Or losses ?
Like this : "Bank clerk: -Well, dear Superderp, since SOMEONE has smashed all barrells full of goodies in our factors basement, our investment has failed, and - sorry - you have lost half of your deposit" .
Alternative to the bank is - always spend all your heavy gold coins (perhaps on your own residence) or keep it in a safe and face a local thief guild members.
Anyway - spending late game money on a house, furnishing, beeing a part of community is an interesting option for anything - form a mini-quest that just gives a game a nice touch - to a whole big quest or a tree of quests that leads to an interesting, alternative ending.
It`s not that unusual trait - especially in jRPG and RPG maker games, but it always lacks depth, a second layer to the story, deeper intrigue.
I think it`s worth a try, even as a small "own a decent property" sub-quest.
E3 is suppose to have more "meat", and such a thig seems to be easy to implement.
example: Buy a set of large chests for residence basement -> (sleep/leave town) -> Chest appears ready to use.
A weapon rack could be practical too.
It`s not going to change game into Terraria/Minecraft, but it`s a nice touch that adds value to the game.