Keyboard layout madness

Why do keyboards manufacturers keep changing the keyboards layout?

It's easy to find a cheap keyboard with a standard layout for less that 5€, but if you want a quality, silent and stylish keyboard (the ones that cost 50€ or more) you start having difficulties.

It seems that manufacturers think that the key disposition can be sacrified for adding buttons that most user don't ever touch! For casual computer users and gamers this could not seem an issue, but when you use a computer for work 8h a day layout differences mean to push the wrong key an the worst times, and this is frustrating!

I have to buy a new keyboard but till now I'm unable to find a comfortable keyboard that has a standard layout.