He seems to be a shamanistic demi-god figure that appears at his peoples time of need to supply them with the right magic medicine or potion to save the day.
The sellers are almost certainly bootleg CD-Rs. IMDb says there was a widescreen broadcast on cable a few years ago, which is probably the source for the clips and DVDs. Most discussions of a possible DVD point to some issue with the original audio elements being lost/damaged, preventing it from being properly mastered. Also the film was shot open matte and released that way on VHS, so you can convert it to a widescreen version by just cropping the top and bottom of the picture (as would have been done in a theater).