I see three benefits:

a) Continued trace
b) Network rendering
c) Specific animations

In cases b and c, the same benefit repeats itself. Why recalculate the map,
when it won't change, no matter where you move the camera to? The idea in b
is that all computers will be working on the same frame. The idea in c is
that your lights and objects don't move. As long as this is true, why waste
time? Say you want to do a walkthrough down a hall with the lights pouring
through the windows and the media with the photons and everything. They
won't change, just the camera position. See what I mean?

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