One of the big time consumers in business is reapeting the same answer to the same questions over and over.
Now most web sites have an FAQ page. But in all fairness when the answers are to long, many visitors will not read them and either:
1) Ask the question in an email
2) Just leave the site to never come back.
An audio answer option explaining your response is just as effective as when you are at a business networking event or having coffee with a prospect and telling your listener the answer to the common question.
You'll not only be sharing some usefull info, bringing your listener to a better understanding of how you can help, but solidifying the relationship because hearing a voice brings with it personality. Personality that is hard to transmit in a brief amount of time with just the written word.