Yeah, fuck those people who made something over 30 years ago, right? Seriously, copyright lasts long enough, 30 years is way too short for stuff to end up in public domain. Most people who made stuff 30 years ago are still alive, it would be unfair to just rob them of their royalties.
It started at 14 years with an option to renew for another 14 as long as you were still alive, in the US.
Mathematically, any revenue or benefit from a work after 30 years is already miniscule. You make more money off suing others. The work becomes worth more as a court document than inherently by itself.
By the way, a point a LOT of people miss is that if copyright expires, you can STILL make a profit off your work. You just no longer have the
exclusive right to it anymore. Disney could still sell Snow White and The Seven Dwarves, and even sign an agreement with Target/Walmart/Best Buy/Amazon to where they agree to sell only official Disney copies, but they could'nt stop someone from editing, remixing, and basing new works off Snow White - much like Disney remixed, edited, and used Snow White herself from the public domain.