My conscience told me it would be OTT too, but I ignored it. :-)

For my needs, consumables costs were comparable. I don't use a printer often enough to keep an inkjet from drying/clogging, so I was buying new cartridges disproportionately often. Admittedly I didn't factor the cost of leaving the thing on standby (no green points for me) but I have a magic plug to deploy, which will turn off the printer when the PC is turned off.