Fantasy sports are a leisure pursuit that is akin to play - and we know really well that play is a very intense, spontaneous, frivolous activity, and that if you can sustain it, you get very dedicated people in it.
If you can keep those concepts of play and competition, the behaviors are somewhat addictive. You can be addicted to fantasy sports just like you can be addicted to on-line betting - and I think there are probably several people out there who are like that.
We know this about fantasy-sport players - they are much more dedicated sports fans than your average American.
Baseball is not quite to that level - though if you watch baseball, they do quite a bit of the same thing, too.
