>Why's it treated as being a "per page" subscription?
Because that's the business model. Consumers care about the ability to print pages. They don't actually care about ink. As a consumer it's easy to see a subscription plan of 10 pages a month rather than 0.01 gallons of ink a month. The people that are disadvantaged are people who buy more pages than they use. This is offset by having unused prints rollover into the next month, but if you never print them then you have wasted that money.
Because that's the business model. Consumers care about the ability to print pages. They don't actually care about ink. As a consumer it's easy to see a subscription plan of 10 pages a month rather than 0.01 gallons of ink a month. The people that are disadvantaged are people who buy more pages than they use. This is offset by having unused prints rollover into the next month, but if you never print them then you have wasted that money.