I call bullshit!
Inkjet printers are very lucrative for printer manufacturers as you need to continuously replace the ink cartridges whether you use the printer or not. If you leave the printer plugged in then it will do a 'self clean' every day and squirt ink into the *surprise surprise* ink pad. And this results in 2 things:
1. You run out of ink whether you use the printer of not - a regular income stream for the manufacturer.
2. Your printer bricks itself due to a full ink pad requiring you to purchase a new printer - more money for the manufacturer.
If you try to leave the printer unplugged for extended periods of time then the nozzles get blocked with dried ink requiring you to either purchase a new printer or new cartridges (if the nozzles are on the cartridge)
I found myself replacing ink every 3 months on my inkjet printer even though I rarely used it.
If you sparingly use your printer then a Laser is a lot more economical as:
1. It consumes next to no power just sitting there - no periodic cleaning, nothing.
2. You can turn it off for years and it won't get clogged.
3. It consumes no toner if you don't print anything.
I now replace the toner in my laser printer once in 2 years.
And guess what, if you do a lot of printing the Laser printer is still economical as 1 toner cartridge will print around 5000 pages on Laser compared to around 500 on inkjet. Yes, Laser consumes more electricity printing - if that concerns you go on a 100% renewable energy plan.
There is a reason why you can buy an inkjet printer for $20 - to suck you into the ecosystem where you continuously have to fork out money for cartridges assuring a regular income to the manufacturers.