punctuation - When is it appropriate to end a question without a question mark?

Basically, if I ask a rhetorical question, it's not really prompting for an answer. Does that mean it should not end in a question mark?

Here are two examples:

• "What's New" used as a title for a section.


• "Who wants to reinvent the wheel." This is meant to be rhetorical, so is a question mark correct?