Date: 07/04/2013 01:00 AM Title: Chapter 1
Cross-overs can be awesome! I agree with you. Some of them are written badly, but then again, that applies to all fanfiction (...and all writing, come to think of it).
Maybe they are more of a niche because you have to be at least vaguely familiar with both universes, and it puts people off? I know I don't read cross-overs sometimes because I'm not familiar with the other universe it's being paired with.