Except that you're conflating "Starter Set" and "Demo Set" (Demo Set = Quickstart).
They are NOT THE SAME.
Now I'm really confused. I own two boxed sets for other space games. One is for Alternity and the other is for the Star Wars Edge of the Empire game.
The Alternity box set has a 32-page Rules Book, a 32-page Adventure Book, Hero Folders (pre-gen characters), a Gamemaster Screen with a ship deckplan on it, and "Adventure Dice". The Rules Book has information on Playing the Game, a Skirmish Scenario, Running Adventures, Skill Descriptions, and a back section with Aliens, both friendly and adversary. The Adventures Book has some info about Adventuring, short sections about NPCs, the star system they start in, and the ship they own, plus 3 short adventures. No character gen or design and the back of the box says the box contains everything needed to start playing now.
The Star Wars Edge of the Empire Beginner Game has a 4-page 'Read This First' example of play and a bit of background, a 48-page Rulebook plus a chart on the back, a 32-page Adventure Book, Character Folios (pre-gen characters), tokens, dice, and a front and back map with a large ship deckplan on it. The Adventure Book (which says Read This Second) completely walks through seven Encounters, and ends with other adventure ideas, rewards, and further adventures. The follow-up Rulebook has sections on Playing the Game, Combat, Skills, Talents, Gear and Equipment, Starships and Vehicles, and Adversaries. No chargen in this one, either. And the back of this box says: Open the box and begin playing immediately.
Maybe I am confusing the two, but could you explain to me if either of those is a "Demo Set" or a "Starter Set"? I'm pretty sure Liftoff! will be compared to the Star Wars box in the gaming community.