1. Because you pair super-atheletes into hypothetical teams and send them on a week -long adventure against your friends. Next week my team is going into the Mines of Moria.
2. Because your league is a bunch of un-atheletic assholes, who probably are just as good at playing real football as a room full of Magic: The Gathering players.
3. Because you have a draft... aka a bunch of dudes with silly team names crunching numbers together once every September.
4. Because you have a League Commissioner... aka a Dungeon Master in denial.
5. Because you spend the end of every fantasy week in a pissing contest over who has the highest score. Yeah, well... I'm still better than you at Mega Man 2.