There's no secret why this new version of Psycho exists. Remakes come in all shapes, sizes, and colors. A rare few manage to eclipse their inspirations, but most are, to one degree or another, inferior.
Successful remakes take older material and do something new, interesting, and intelligent with it.
One could even argue a case for Dino DeLaurentiis' 1976 King Kong , which, while lacking the creativity of the original, performed an update by injecting an element of campy comedy. However, for every good remake, there are probably ten bad ones. Both committed the same sin - they changed a brilliantly dark ending in favor of something upbeat. The Psycho ramake is like none of these. In fact, it is like no remake ever committed to film.