the thing is, one of the the things that makes both games fun is their differences. I LOVE football way more than baseball, but I like fantasy baseball much more.
That said, in fantasy baseball, the fun thing is that your advances are by definition, at someone else's expense. For example you can trade for SAVES or Steals in fantasy baseball. In fact, if you can't gain there, you can trade yours to a team that can knock down your competition.
But roto football, how would you trade for cats? I mean you aren't going to give up td's, because most of the time, those are the guys with the yards anyway.
The opening scene of the movie "Saving Private Ryan" is loosely based on games of dodgeball Brian Dawkins played in second grade.