Yeah, that's my setup, too. My receiver doesn't do HDMI, so my cable box and DVD player go straight to the TV.
Also, keep in mind not everyone has a surround sound system, but may have things like a cable box, PS3, DVD player, Popcorn Hour, or any number of HDMI devices but are content with the TV speakers. They'll need multiple HDMI inputs.
Don't believe everything on the Interwebz! A duck's quack DOES echo!