Interesting question Jim. I will be following along with the responses for sure.
I use Band-in-a-Box to
1. Provide inspiration for my songwriting
2. Provide inspiration for my own unique versions of cover songs
3. Provide the backing for the recordings of the above
4. Practice my guitar (soloing)
5. Practice my sight-reading
6. Provide backing tracks for live performance
7. Inspire other people
Keeps me busy