Psionicist
Explorer
Player: I think I want my new character to be a wizard.
*silence*
DM: Are you sure?
I few days ago I read parts of the Book of Exalted Deeds. I noticed the Vow of Poverty feat and read the description. If you don't have the Book of Exalted Deeds, in short Vow of Poverty grants you a whole lot of power if you never, ever use material possessions again, including magical items. In fact, the only thing you can use is cheaper clothes. Because of obvious reasons, the Vow of Poverty is not for everyone. Sure, it's technically cool. But on the other hand, most players want their weapons and magical items, so very few actually take the vow of poverty.
What if Wizards or Sorcerers were like this? To cast the spells, you must sacrifice something so only very, very few actually want something to do with the arcane. But those who does, man they will be powerful (or a better word is "special"). Arcane magic exists, it's fantasy, but I don't think it should be for everyone. Wizards should be rare because most people (and players) don't think it's worth the high cost. Yet, wizards should be as fascinating as they have ever been... The real world equivalence is probably astronauts. Absolutely not for everyone, but interesting nonetheless.

Any ideas how to accomplish this?