Is there a reason why the Color Samples window has the option to sort by Red, Green, Blue value options instead of just sorting by value?

If we had the option to have the program convert the color samples into gray values "then" it would sort by values and ignore the color status? I am not sure if ArtRage can do this? The results may look strange and this is why the ArtRage team decided to go the three color route?

Thanks for your input in advance ArtRage dev team. "Values Do All the Work. Color Gets All the Credit".