Sorry for hijacking the thread DD D:
My main issue with the big gap is that there isn't even a little gap there - I personally feel it's worth discussing consolidating the Spotted Tribal & Unickorn lines. If this actually happened though, it would force the big gap to move either above or below them, which leads to the valid concern that people may feel the pets that were moved above/below are more/less valuable when that isn't the case.
Regardless of the line consolidation suggestion, it doesn't change the fact that the big gap is in the worst position it could possibly be in - the pets it separates are the closest in value on the list than any other pets on the main list, and this would be confusing for anyone trying to trade those pets for each other.
I do agree that it is useful as a marker, but perhaps that suggests replacing it with two markers to split the list into thirds would be a helpful option to consider. We could have an Upper Main List, Mid Main List and Lower Main List, or July/August sections, or Above Non/Below Sorbet markers since they are prominent pets when calculating values of other list pets. There are all sorts of options that can be considered. Heck we could even rename the Big Gap to the Little Gap to emphasise that the gap between the pets it separates is so small, then we wouldn't have to even move it or add another marker.