Java EE 7 Batch Processing and World of Warcraft – Part 2

Forgive me for seeming naive, but as an avid wow player, what's the advantage of using this instead of using an addon like Auctioneer, if any?

Don't get me wrong, it's a really interesting article and I enjoyed reading it, but is there any practical use for it or is it just 'reinventing the wheel', so to speak?