Inspired by the fact that quite a few printers are reputed to come
with half-full ink cartridges so you have to replace them before long
perhaps?

When I bought my printer, it came with a free second toner cartridge in the
box. Both cartridges were (clearly marked, so no deception) half full. Why
they just didn't supply a single full cartridge, I have no idea. It gives me
more spares for refilling, I suppose!

Christian.