Holy sheet... I thought my sublimation inks were expensive, but those numbers are crazy.
I keep hoping that DTG will reach it's potential as a true screenprinting alternative, but each new generation of machines just seem to disappoint me again.
The ink isn't cheap but those calcs assume 100% coverage over the whole area in question. We don't assume that and regularly print 16 x 18 prints. The real killer isn't actually the ink at that print size most times. It is the time it takes the printer to print it.
The biggest downside to DTG printing we have after getting a GT-782 is that when doing CMYK we are single threaded and with white ink we still end up waiting for the printer if doing large designs. For the large designs, I spend much more in labor the for the operator to stand there and wait for the print to finish than I do in ink per print.