Because there's a huge library of laser titles that have yet to be released
on DVD and, in many cases, never will because of lack of interest, rights
problems, and various other issues. There's an even larger library of VHS
titles that will never see the light of day on DVD, just as they are films
that never appeared on any of the above-mentioned formats.
My favourite resource for used lasers (and excellent prices, too) is Big
Emma: http://www.bigemma.com/. They also sell used DVDs, for those
As for the original question: laser discs are no longer being produced.