I love burst mode!
I don't use it in "hopes" of capturing the decisive moment, I use it because it's there, because it sounds so friggin' cool, and because, as angryman above just pointed out, 10 frames is better than 1 to capture the "perfect" moment.
Not only that, but if one waits to capture an "ideal" image by using single frame shooting only, they'll never know what they may have missed by NOT using burst mode. There are so many intricacies in an image, or in a "scene" that we do not notice when it's happening, that the camera would capture, but if we don't take an image of it, we'll never see it.
It could be something as simple as the grimace on an athlete's face as he/she is exuding all of their energy, or is getting hit, or knows that they've screwed up, whatever. It may the a reaction just AFTER the "peak action". Whatever.
My point is, while it is possible to get a great image shooting single frame only, if shooting in burst mode, that single great image could quite easily become SEVERAL great images.
Maybe in film days where you basically had to pay for each, and every frame, with digital, that isn't really a concern. Why limit your possibilities?
Again, I'm not talking about "sprayin' & prayin"...I don't think shooters from S.I., Getty, etc just "spray & pray", they know what they're doing, they press their shutters at the precise time, but I can almost guarantee you, that when it comes to photographing the action, their cameras are almost assuredly set to full burst mode. The higher/faster the better!