Easy to replace, and cheap.
I only own one Mauser, a 24/47, and the safety lever never operated properly. A little home machining in an attempt to get it work only screwed it up worse.
They can be a real pain...
Far as value, I don't see how it would matter...they're pretty universal far as I know, and not serialized- so you'd never know if the broken one were "original" to the weapon, or not.