A perfectly sensible approach - anyone who photographs people or animals will know how easy it is to get an unusable shot because someone blinked at the moment of firing. Multiple frames improves the likelihood of getting the required shot. It's a simple matter of doing what's necessary to ensure the end result.

Further to that, press snappers tend to wait for particularly expressive gestures - hand movements, facial expressions, and so on. The latter especially can be extremely fleeting, and the face changes dramatically during the course of the expression forming. Again, a fast frame rate catches all sorts of things that with the naked eye we don't even notice. Sometimes those are the very shots that make it onto the front pages. I believe some press togs have even abandoned the still camera altogether in favour of digital video, as the resolution of that has improved enough for them to be able simply to select out just the right individual frame from the 'continuous' footage.