Digital BW, The Print

Given that I cannot find any info regarding CIS systems and the 
Epson 3000, I am going to assume that solution is not available.

In that light, given similar printing, are the Epson 3000 cartridges 
similar in volume to those of CIS systems? What I am trying to 
determine is if by choosing a new 3000, ink costs are going to be 
abnormally higher than that of a 1280 or similar setup.

Thanks in advance.

Andy Biggs