I have a Laserdisc player by "default" as a collector in the guise of the Pioneer LaserActive, which not only plays laserdiscs, but through the use of pop-in modules plays Sega Genesis/Megadrive/CD games and Turbo-Grafx/Duo/PC Engine stuff. There was also a karoake module. Right now I only have the Sega module. There are a decent selection of games that require the specific Sega or NEC modules and come on laserdisc. Essentially it overlays standard Sega or NEC graphics over laserdisc video, similar to some of the original laserdisc arcade games.
Anyway, I had wanted a laserdisc player anyway if I could find one cheap so I could have an unaltered and high quality version of the original Star Wars trilogy, but since that's now coming to DVD there is little reason to have one for its movie playing abilities in my opinion (mine did come with some movies, though). Again, though, as a computer and videogame collector, it's good to have a LaserActive just for the games that are unique to the system. Of course it's going to be tough finding that NEC module for anything resembling a reasonable price...