So yeah, you're paying $70 for cardboard... But can't you say the same about all videogames; just swap out cardboard for plastic (the disc).
Not saying your points aren't valid, but it's just been bugging me a bit to see people not make that connection.
I haven't bought Labo yet, and I may never (at the price it's currently at). I'd love to get it and put it together with my daughter, but it doesn't look like these are things meant to be taken apart, and I have little room to store extra boxes, so it would likely get thrown away. Can't imagine people wanting to buy a used Labo kit, but who knows...