I was skeptical of that "15 pages/month free" deal when I saw it. For an infrequently-used inkjet, most of the maintenance cost comes from keeping the ink fres

I was skeptical of that "15 pages/month free" deal when I saw it. For an infrequently-used inkjet, most of the maintenance cost comes from keeping the ink fresh (which is why I have a B&W laser.) How could HP ever hope to profit by maintaining idle printers for free?