Actually it's the ember topaz cuts that get undercutted the most for me mainly because it takes longer for them to sell then the inferno rubies. Maybe one of the JC's that bought my low listed gems bought it for a guildie but I"m sure the other one bought my things with the intention to wait for people to stop posting that paticular gem and set it at his favorite price, 495g. I know at that point if it costs that much someone has to be really desperate to buy it cause most of the time most people will just buy the raw uncut gem and get someone to cut it for them either by asking in trade or asking in guild. I dunno know though this guy who try's to kinda control certain gem markets who resets the price at around 495g must have an incentive for doing it so I should assume he is successful sometimes.
I have quite a bit of weeks of data on market watcher and learned that those gem cuts that the two JC's bought me out sometimes in gradually go down in price considerably after someone tries to reset the market on that gem. I guess that is the same for most gems I guess. Those darn undercutters.
Today someone undercut a lot of my ember topaz cuts for a huge amount and brought down the prices a great deal and I think this will cut into my profits

This inspires me to start testing the waters in the flask and potion market cause now I have to prepare for days where someone does a dirty rotten thing like that. I just want to know, anyone know the reasoning behind why someone will undercut you for over 50g, or even 100g? Whats the point?