Yes, rhetorical questions still have question marks at the end.
Even though the speaker doesn't expect a direct answer, the structure and purpose of the sentence still fall under the category of a question. The question mark helps readers understand that the sentence is intended to be a question, even if it doesn't require a literal response.
For example:
* "Is the sky blue?" (This is a rhetorical question, but it still has a question mark.)
* "Do you want to live in a world without pizza?" (Again, a rhetorical question, but with a question mark.)
Let me know if you have any other questions about grammar or punctuation!