Being put on hold, and played a rude, dumb or obnoxious message bugs me. Don't get me started. Here's the solution. Make people think. Be new and innovative with the information you present.
People spend an hour a week on hold.
In order to make an impact, you better differentiate yourself with content that generates thought. Create a pending need. Ask your caller thought provoking questions that leads them down a road that ends with an investment in your product. Show off in an unobnoxious way. Make me laugh and you can make me buy.