All great questions. I have not see any quotes from Ricoh direct or dealers offering tiered color rates. Does not mean it's not out there, maybe just not in my next of the woods. We do not offer it.
"It is probably fair to assume that 0.5% colour will be the same cpc as black and 0.5% - 7.5% plus will all be charged the same rate." Black is a color right? Curious to see how that works also. If all color (including black) is lumped into one barrel, and the cost for .5 is .02 then that would be quite a money making.
Can anyone else help with this, I know there are a few Kyo dealers on the site that is selling tiered color