Digital BW, The Print

I am about to order some extra ink for my 4 col (1160) CFS and was 
thinking about  mixing pint and 4 oz quantities - I seem to use Black 
the most, Cyan 2nd most, then Magenta and lastly the Y (toner).
Does everyone use this kind of ratio or is it just because most of my 
shots are "dark" ?

frankg