I think you are on to something.
I mean why are there no toilets in kotor?
WHY DON'T you add TOILETS!
Edit: This sarcasm was not intended against you Malkior, or against Hunter Qyzen.
You have a point.
I agree that in-depth thought about realism in a theoretical scenario surrounding a fully artificial game level seems superfluous at first, but please bear in mind that toiletries would add little to nothing for gameplay opportunities. (other than a toilet cleaning minigame, but who wants that? )
However, I feel this is a bit different than finding "problems" with the realism.
My personal belief is that fleshing out a viable economy other than the cliche' Cantinas and Swoopracing seen everywhere on other worlds could make for unique quest opportunities and possible ways to connect the gameplay to its grossly underutilized setting.
Needless to say, I also believe this is the case for Onderon as well, but that is a topic for a different thread.