We actually know a top insurance sales guy who did a sales motivational message every day just like this, and people used to call just to listen to his thoughts.
Generally, people that call and leave messages are more likely to be ideal customers of your business. Your voicemail message is often not much more than a formality to the person calling. Your message is a period of time that they are forced to wait through in order to do what they called to do in the first place — relay information to you.

If you aren’t sure, have a friend listen to it and give you pointers. It’s always disorienting listening to your own voice, so you might not be able to catch if you sound weird because you’re hearing your voice or because you are actually speaking in a strange manner, but someone who knows you well will be able to clear it right up.
If you’ve already created a custom voicemail on your iPhone, you can tap Play to see how your voicemail sounds. If you’re interested in creating a new message, tap the Custom button. From here, you can start recording your message by tapping Record and tapping Stop whenever you’re finished. Once you’re finished recording, tap on Play to make sure the message comes across as you’d like and hit Save (in the upper right) to save it as your voicemail.