Sounds about right. Which would make this corner case about 5-10x more expensive than a laser, which is close but below one order of magnitude difference. At these points and with such infrequently printing, the cost of the printer itself becomes more relevant than the cost of ink, and that favors inkjets and inkjet multifunctions (e.g. dual-sided ADFs can be had for around 50€ inkjet, since they obviously under-price them; much harder to see these prices for lasers or even non-cartridge inkjets).
I’m not sure it’s a corner case. I print a handful of times a year. I’ve had my $80 Dell laser about 10 years and just had to replace the toner and buy a second ream of paper. This seems about average for people I know.
If I’d bought an inkjet I suspect I’d have had to buy a new cartridge at least once a year wiping out any savings on the printer itself even if I had gone for the more expensive Brother (which would have been less of a pain on a Mac now that the old Dell drivers barely work on current macOS.)