So is having Role Sims staffing the objects like cash registers, bars, and barista counters who actually bathe at least occasionally. (probably not one of my more helpful comments, to be fair)
The lot attractors can also be trait based, or at least some of them are. If you by chance or design have a town full of rebels, they will want different kinds of experiences and be attracted to different kinds of lots than say divas, the avant garde, athletes, those who love to swim, or the socially awkward might. Having a lot of sims in town who work night shifts would tend to not leave as many available to populate venues after hours, and of course the reverse in the daytime.