I have an HP 3630 networked printer. It stays on as I subscribe to the HP Instant Ink service at its lowest level of £1.99 per month. The printer needs to be able to send its ink levels back to HP, so that new cartridges can be sent when appropriate.
I've paid 8 lots of £1.99 so far, with no need for a re-supply.
IIRC, that a set of genuine ink cartridges are, at best, £26 or so. I reckon I bought at least one and sometimes more, sets a year, I think it, for me, is an OK deal.
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