Obviously this idea has been heard over and over and over.. and yet its still not in game. I have a bit more to add though.
I want it so that players can open their own shops on their profile or house or whatever. Click the spoilers for the ideas to help it.
Away from the selling items, before there was mod town there was a cave where there was a guy digging for treasure. Perhaps you can use one of the cracks in the wall and bring back that cave. There are multiple levels of the cave. You can get a pick and a hammer and use the shovel already in game. Possibility to get gralats or minerals you can sell.(kind of simularly to era). Once a day the cave will spawn something rare like a hat or mount, or a new gani. It will spawn at a random time. Lava will be found far down into the cave and will damage you like the red liquid in one of the house types.
TL;DR? Aren't you a lazy one?
I have more stuff but I just can't remember. When I remember I'll post it.