it's a great idea but again, like everyone says it probably won't happen
however, there is a similar idea, there are lots of "small" shops already. there are shop stands where you put your items and people can come and look, and buy. these are located in mostly amethera apartment buildings in the base floor, but also found some in hadesheim. there are also little rooms like shopping mall shops but not exactly, in amethera. they probably cost a fortune though (as they are estates)