When it comes to my daily life communication I often use rhetoric to emphasise an idea or statement.
For example, I noticed, when you start your talk with a rhetorical question your audience pays more attention to whatever you say. In my opinion, that happens because people need some time to analyse your question since it has been veiled!
On the other hand, it might not be such a good idea to use rhetorical statements when you are trying to convey an important information. It might be misunderstood by your audience.
Also, it is essential for me to be aware of my audience and the communication channels I am using. Writing an email to my professor and writing an essay are two different things. In the first case, I want to be straight forward and clear, whereas in the second case there is some space for imagination and rhetoric.