Questioning how TTAB's really work...
I've started doubting something that everyone assumed was correct so far, and I will update my "More Intelligent Bathrooms" mod on MTS shortly to test if I am correct in my doubts, because I've had multiple people complain to me that my mod is not working as intended, despite me exactly following the instructions from this tutorial back in early '23 when I created the mod. Back then, I wasn't as experienced in modding yet, and did not really question tutorials on the Internet either.
To the matter at hand. There is a non-zero chance that the explanation provided by @dramallamadingdang regarding TTAB's... is wrong, because of an oopsie in SimPE.
iCad's exemplic study, the FreeTime exercise bike, according to SimPE, displays following advertisement values: Base 0003, Delta 000A, Type 0023. iCad checked the TTAB entry on the MTS Wiki against it, and did not find type 0023 in there, but for the tutorial did not follow this oddity further, instead asking people to just set the value to 0000 to apply to all Sims equally.
Now, while the exercise bike was not present in early EP's, we can look at other objects and look at its own TTAB advertisement values as they are displayed now, and as they were displayed in, say, Open for Business. Because, in fact, Pets introduced new TTAB formats that allow you to set separate advertisements for different motives for Sims and pets. And quite notably, many interactable objects in the game were subsequently updated. Sometimes, values were just switched around, while sometimes, they were completely overhauled.
It's the switcheroo cases that made me open my eyes and come up with this hypothesis.
What if all the columns are actually shifted by one in later TTAB formats, causing the labels and columns to mismatch?
If we look at the exercise bike again, suddenly the advertisement values make perfect sense. Instead of type "23" weirdness, we have a very clear bias towards Active Sims (type 3) using the exercise bike, which is also observable in-game.
But also, for the medicine cabinets where I saw a type "32" I couldn't make sense of, suddenly this is just a huge Delta for Neat Sims (type B), and I finally have an explanation for why Sims almost never wash their faces (because only Neat Sims are enabled to do so at all, and even then brushing their teeth advertises to them so much more).
Again, as mentioned in the beginning, I will update my Bathroom Intelligence mod shortly to reflect these new findings - let's see if I'm right.