I think that gluttony is never a good thing. As you can see from the video it is never good. It is crazy to me that people eat that much and continue to encourage eating this way. Laine brought up the point that someone who is starving should be able to commit gluttony. Which is true yet its difficult to decide ethically when any sin is okay.
On the website of the restaurant is says "help ugh fight anorexia" which is pretty deep. It is not something that is funny and this man is being pinned with the sin of greed and gluttony.
Although gluttony usually is never a good thing, greed sometimes can as it can get you your way. For example, the girl learned that by being greedy she always got her candy and she learned to use the restroom.