[i speak in math]

Originally Posted by Vikkki

Anything to get the shot the way you want it.. Flash can create drama in your pictures that available light can't.
Consider this picture for example : I fail to see how you can recreate this effect using available light..

So, yeah.. U may use it once in a while, but there is no reason to not have it with you for the times you might need one.
-Vikram.

To be fair, there are 2-3 strobes in that shot, not 1.

Having a strobe or two really depends on what you shoot. If you are into portraiture, then yes, you must have 2-4 strobes. If you are into macro, then yes, 1 strobe will do. If you shoot other things, ask yourself if you could improve the shot by adding light creatively to an area. If you can improve your work with a strobe, then yes, get a strobe.