A very weak point of the many weak points of SL in TA has been believability. Nowhere more so than in the management of LL, where a know-nothing teen (Lily, and not criticising her) is meant to be credibly all over the running of a considerable operation full of invisible workers. All of this could have been explained in an ep where LiLy actually said anything about this.
Along with the many-roomed houses of TA, the miraculous ease of managing/starting up businesses, i.e. niche gins.