Okay I have dvd players that work fine even still. DVDs need care - scratches and fingerprints are bad (though the error correction on a good player will make it less noticeable). I think the lifespan of a dvd player may be in its design (where dust may get to the laser?) or the environment (humidity or temp may play a role?)
It's possible that DVD players are extremely low quality now, since there are very few people still buying them.