It's because most photographers are male. Men think in primary and secondary colours and the major shades. Red, green, blue, black, white, grey I can understand. "Beige" isn't part of my vocabulary. Neither are all those other colours that only seem to exist for women like “amethyst”, “fuchsia”, “taupe” or “mauve”. I have absolutely no idea what those colours are.... never have known and am happy NOT knowing.
So... my big "L"s are lighter than black, are not obviously blue or green therefore they must be WHITE! Simple

yeah right and males only make B+W or primary colour pics 
- I don't even want to think about it. 

