Certainly. Not always but it is common enough. We are not able to produce mana as other living beings can so we must have a mage to aid us in the effort. Otherwise matters could grow worse. We could fade away or we could grow mad and steal what we need from those around us.

[He waves his hand after that.] Ah but I find I would prefer to fade away myself. It is unnecessary to bring such harm to the innocent like that.