Although those luxury master wines were not as effective as fresh crystal cores, they could be used every day. If one decided to use a luxury master only for training purposes, a bottle could last up to a month.
On top of that, those luxury master wines would not crash with a fresh crystal core, so they could be used simultaneously to achieve the maximum effect.
The Goff family saw those luxury master wines as a type of training potion, not tasty wine. Therefore when they gave it out to their wizards, they all demanded them to use it accordingly.
Abel still made Bernie very happy for giving him 200 bottles of luxury master wine at once. Although he always couldn't understand why Abel was constantly worrying about his safety, always demanding the tightest protection to keep his security.