I have played Magic and while I have tons of useless cards, I also have cards I've sold for $40, cards I've traded away, and cards that I've put into standard decks. I've also given my unwanted cards to younger players who have used those in decks. None of those are options with this draft method. Drafted magic cards can be used due to the design of the overall game, while in a LCG they cannot (unless you are doing some weird ass starter deck "just to see" but due to Netrunner's complex rules I doubt that there will be a lot of people drafting who don't already play). Drafting with Magic also costs about $15 and this is $20 if you already have your starter. The price point just seems REALLY out of whack for what is a game you play once.
There's no rule that says you're not allowed to have more than one deck constructed.