batsbrew
WHY would you not want to create your own backing tracks?
i don't get it...
For pretty much the same reason as I enjoy collaborating with other people. These tracks have things in them that I wouldn't have thought of, and lead me to play differently.
Personally I'm not capable of creating (for example) a Bonamassa-style Fm ballad backing track, so having one to play to is a cool thing.