• They are busy doing research: Becoming a all-powerful mage isn't that easy you know! The magical world is incredibly complex and requires years of research.
  • The normal world is boring: Would you prefer learning magic, or wasting time in the normal,boring world?
  • The normal world cannot provide what they need: They need magical items for their research. Even if they have tons of money in the real world, there isn't anything that can be bought for research (somewhat implausible but still. The normal world does not have 'magical substances')
  • They have to follow the rules: The all-powerful Council of Mages has decreed that no one can influence the mundane world directly or indirectly, and have special enforcers who will not hesitate to kill those who don't follow this. Punishments range from having your magic bound permanently (so you cannot do magic) to death. Or worse ..... being expelled.
  • Generations of magic: For generations your family has been in the magical world, why would you be different? Especially important for those of 'noble' lineage, who will not want to shame their families by not becoming a mage.
  • Reduced Strength: Most of the areas in the normal world are very weak 'magically', meaning mages will have greatly reduced strength. This is very disturbing for a mage, as they are losing something they had from birth. There are rumours that spending too much time in the normal world can cause one to lose their magic permanently.