Yes, we live an hour and 15 mins from Nashville, and I looked into that trip/pricing a while back out of curiousity and was appalled at the cost, having done some of the things on it in the past, stayed at the hotels before, etc. You could definitely manage a nashville trip on your own for a fraction of the cost and the help of tripadvisor.
Unfortunately, I am not surprised either. While it is a great city to visit, we just did it on our own in October for much cheaper than the ABD. It didn't offer anything that we couldn't book ourselves, so we would rather save our $$ for trips where we really need the ABD guides: China, SE Asia, South Africa, etc. or offer special activities we can't book on our own like Backstage Magic.