With auctioneer.. I can have it automatically undercut by 1 copper (or any other fixed amount, or by a percentage).

And I can set it to not have more then 'x' total auctions of a given item running at once.

I don't believe I can match the other guys price, if he's the lowest (which is my agreement with him) and still undercut (by 1 copper) anyone if they're the lower priced then myself or the other guy. At least not with auctioneer.

The ideal situation might be to find a buyer for uncut epic gems, take the 30g hit on not cutting them but then not have to manage anything like inventory or partake in price wars. Dailies got boring, which is why I've started the alchemy transmutes, but undercutting could be as much time but spread over more time. Something to look into anyway.