Got to thinking about it as well..
if anyone wants to for now, I would be willing to host the table for you and we could create a kind of 24/7 store like this in a way.
You can select a specific persons inventory and see what all they have FT and also have a master list with all items where you can search for an item and anyone who has it you can see theirs + prices to find the best deal
LMK if anyone is interested, would be a neat little project to take on, and the best part is I really don't have to re-write anything, just have to do some filtering