Nah I think it has less to do with nostalgia or parents buying it for their kid, even though those are probably factors. Mario Bros/ Super Mario Bros. is one of, if not, the most widely known videogames of all time. Even those who don't play videogames are at least a little familiar with SMB. Which is why the NSMB sold so well when non ganers were already on board with Wii Sports or Brain Training.