Basically any best selling Lego set will sell pretty high if you can store them in mint condition during 20 years (the time for the kids playing today to become

Basically any best selling Lego set will sell pretty high if you can store them in mint condition during 20 years (the time for the kids playing today to become 30). But I guess it’s not that easy to store enough of a high volume toy (when boxed) during 20 years for the operation to be really valuable. (Edit : imagine just having kids and a room full of brand new legos)