Generic RGB Profile Color Picker Problem

Hi,

I am using Generic RGB Profile instead of Color LCD. (in display => color settings) But when Generic RGB Profile is active, my color picker picks darker colors. For example I pick over and over the color on the color picker, then it's getting darker continuously. So it doesn't pick the same color, it takes the color and gives me darker color of this color. But this problem only happens in Generic RGB Profile, not for example in Color LCD Profile. I tried this on my MacBook Pro 2011 (it is also Mountain Lion) and there is the same problem. So I wonder in every Mountain Lion is this problem exist?