Never.

(Hey, are we allowed asking questions that only have two available responses, like "Are you an inventor or an innovator?")
(Inventor = person who makes new things.)
(Innovator = person who makes new things based on things already made. Example - someone invented gummi worms. Then someone came along and using the gummi worm's example, innovated gummi bears...or the other way around...ah, you know what I mean...)