That actually isn't true. Luck is the element that it shares with gambling but I have found there is a good deal of football knowledge involved. For example, if you were playing the odds this last week you went with Houston's defense. There were at home and had been playing lights out for weeks. KC has a solid offense but no real game changers. In the end, the Houston defense didn't have a bad day as those things go either but it is tough to play great defense when your own offense is giving the game away.
The skill in daily fantasy is in writing the correct narrative for the game. Will one team get up big early and if so, how will that effect things like their run game? Or the opposition's passing game? If one team specializes in taking away the other's best weapon who steps up when/if that happens? Figuring that sort of stuff out is where the money is.
Can it be reduces to just numbers? Yes, but the guys who can do that are really so few as to nearly not make a difference.
The other thing to remember that the regular season is often about matchups, like going with the QB playing New Orleans this week. The playoffs are less about matchups and more about consistency and touches. Who is going to get the workload. For example this next week I will be putting Gronk in my lineups even though he is going to be playing against one of the best defenses against the TE position this season. Why? He will see the targets one way or another.
Just my two cents. I'm admittedly not blowing the field away on Fanduel but I am beginning to understand the principles better. It is really NOT like playing in a season long league at all.