HP's plan also drops prices when you subscribe to more pages.
$1/month -> 10 pages
$4/month -> 50 pages
$6/month -> 100 pages
$12/month -> 300 pages
$25/month -> 700 pages
In my mind, the value for the consumer is at the lower prices, where it's nice to have a printer for a few pages a month, but you know the ink is going to dry in the cartridge before you use it. I'd think HP's program will send you a new cartridge when you need it in that case, but I don't know. At higher volumes, it's probably less expensive to buy cartridges as needed, unless all your prints are full page coverage. But then ink jet has a weird niche; it's cheap, but it's worse for low volume printing because the ink can dry and foul the machine, and it's worse at high volume because the print speed isn't near laser (or highvolume impact!) and the supplies are expensive. It's great if you print a few pages a week to a few pages a day. Warm up time can be better or worse, depending on how long it takes to squirt all the ink into the sponge before it prints.