i see no issue with putting your own private cat's sale in the normal sale place. like
"i have a pure genesis no trait cat i will be selling at blah blah auction today"
now i'd assume the auction place would say "come to blah blah auction today at 4pm, theme is dress like your favorite food"
to me those are 2 different things. i'd use discretion personally
so i think the 2 categories are for
1. business or auction houses post in the auction section
2. personal sales post in the sales sections and of course indicate WHERE.
if we see posts which seem to be trying to misuse the categories, we can surely as we do, privately write the people and give them a gentle heads up as i think most of the community is pretty darn good at being cool
if that's not clear please do let us know