Category talk:Profitable Alchemy Items

How does this category work?
This category automatically updates whenever a price is changed. It must be doing math on the item to decide if it belongs. Anyway, I'm wondering how I could make something like this of my own, such as for finding all items that lose less than 50 coins per alch. See my page on this for more information on my goal. --MarkGyver 00:04, November 22, 2009 (UTC)