It means people who need the cheapest computer can get it, and people who want to upgrade pay a small amount and get all the upgrades in a package without jumping up to the MacBook Air, etc. for much more.
Most people have no problem using a keyboard in the dark or with light from the screen.
Backlit keyboards are a nice-to-have, not a showstopper.
Not terribly happy about the USB 2.0 port as well