Maybe regeants and components should make spells more powerfull, but they should not be necessity for spells. Maybe some more powerfull spells could require rare regeants and components. Maybe regeants and components should vary in their strenght of powering?
So some common regeants could power up spells just little, but more rare regeants could power up spells a lot.
Powering up would be seen in damage, range, duration, etc...