Like Those little omegaton habitat shops, you will have to generate your own traffic, you don’t get much organic traffic like the malls do from what I see. But they are highly visible and not hidden away like the omegatons, so I think they are potentially more valuable.
Assuming they are 50IP, (I’m not sure, haven’t checked) Up to 15k for one close to the doorway, maybe 10k for the out of the way ones.
If one comes up for sale I would probably buy one for an investment.