To Audio or Not to Audio?

Should I, or should I not, convert my self-pubbed books into audio books? My publishers won't take that route, but I've heard several authors discuss the advantages of it. However, my audio versions would only be available for sale through PayPal on my website if I don't choose to pay $$$ for a professional company to do it.

It's a bit of a quandary. Suggestions and ideas would be appreciated.

(Note: AEQUANA has already been done, and the full book took 6 cd disks.)