I hate epsons and never recommended one to customers for general use with I was in that field
sounds like you have the R800 or the larger photo printers.
Epsons have a build in print head that dries up...also everytime you turn on your printer the head is cleaned. This uses ink. So if you use black only but turn on your printer 3 times a day, you'll run out of all of your ink eventually.
for example. 10 cycles of deep head cleaning on an epson once used about 1/3 to 1/4 of the ink in a cartridge as I recall.
HP, canons etc seem better, print heads on the cart or a removable/replacable print head.
Personally if you have to have an epson my advice would be, print a test page once a week or fortnight as print heads dry out and nothing can really unblock them in my experience (try 3-4 epson printers from work all on an ultrasonic cleaning process)
also for B&W bits and pieces, get a brother laser printer, like a 2030 if you're printing a lot. i will save you money on epson ink!