I think this would be helpful for everyone. The highest price is that I saw the highest price about the item, same to the lowest price. The highest sold price is that I have seen the items sold out in the shop, I'm not sure if it would really sell at this price. The abnormal price is that I think that price is too high or too low.
Not trying to be rude here, but maybe you could volunteer to help with this one? There's more than one person working on it, and it's always up-to-date ! (https://docs.google. com/spreadsheets/d/1IihQJyMnLJjj7NMhWV_rInWISFcm3BXMrJgVGVtqi9s/edit#gid=0)