In my opinion best investment options with sealed vhs are
- Horror titles from the 80s sealed (VHS has incredible horror covers and I believe they will do extremely well in an auction) also they are scarce as most of the horror movies were opened to be watched so population report should be relatively low (like precode horror comics)
Movies released from 1980 -1985 1st releases with watermarks like Ghostbusters, Back to the Future, Karate Kid, Star Wars, etc I consider 1980-1985 the golden age of vhs so any classic/cult movies from that time period will have a tremendous nostalgia factor behind it
Movies with Superstars like Sylvester Stallone (Rambo/Rocky Movies) Arnold Swarzeneger (Predator/Terminator) but not the 90s movies with them
Stay away from movies from 1989-2004 unless you can buy them really cheap (because there are a ton of those out there (think modern comics)
ironically 2005/2006 releases should be a good investment because 2006 was the last year vhs was produced so movies like Batman Begins, I Robot, Napoleon Dynamite should have strong value. at that time people and also last movie ever release on vhs "A Hystory of Violence" with Viggo Mortensen