True. But
so many games and other apps require multiple fiddlings with the config file, or taking a second screenshot because your character blinked and consequently has the message that the previous screenshot was screenshotted in the corner, or which write the file in an artefact-laden jpeg format, and to a directory that I can't find, or even if I can find it it's 18 levels deep and takes 15 hours to navigate to using Windows Explorer, and that's if I can work out which key is used for screenshots, and ... etc. Whereas if I use Fraps, they all get written to the same place in a nice uncompressed bmp format without any extra gubbins drawn on the screen and no faffing about with config files. Which I quite like.
