Any non-obvious reason to declare JAX-RS service beans as prototypes?

[KARR, DAVID (ATTSI)]

I'm getting back to using CXF again.  I looked at the previous
application I implemented with it, and I noticed that I defined my
service bean with prototype scope.  This seemed odd, as there didn't
appear to be anything in the controller that obviously required that.
Is there something non-obvious that makes service beans work (or work
better) with prototype scope?