The are only two vendor malls that I currently know about. Melody's TFA that is 2x over priced and a new one that popped up at Skara Brae (good prices but not anything special).
Edit * I do not even look at the vendors in yew anymore. Lucky to find someone on it that isn't 3x over priced. I would say a good 90% of yew is empty vendors which are so annoying clicking
The custom vendor mall will actually help everyone. I do not know of a single person that charges for vendor rentals because there is so much prime real estate.
If the population ever comes back and vendors start popping up in other places, then I would say we could discontinue it. Right now the only need for it is because of the almost complete lack of vendors.