interaction and narrative: Why interactive?

A few reasons why making an interactive work on a network like the internet might be as worthwhile as making a broadcast or theatrical work:

it is pervasive media that reaches deep into daily life
instant, low-cost publishing
instant feedback
enthusiastic communities
worldwide reach with a mass audience
a conversation between artist/author and audience
collaboration and sharing between audience members
self-sufficient work – an emergent community may be large enough to support itself without external authorial control

And more.