I started playing Rotisserie baseball in 1985 -- I was 15 -- and fantasy football two years later. In college I played ACC basketball fantasy; this was pre-Internet and scoring was a bear. I spent my 20s as a baseball writer for a major newspaper.
So I understand the appeal, even though I hadn't played fantasy sports from 1998 until three years ago, when my sons (then 11 and 9) and I started playing Fan Duel college basketball. We didn't bet much, broke even over a few months, and probably would still be playing if the NCAA hadn't pressured the DFS sites to pull it down. (Such hypocrisy from the NCAA. My sons became huge college hoops fans because of DFS. We were far more likely to be watching Boston College-GA Tech than we would have otherwise).
I remember in the late 1990s during the first Internet stock boom talking to a colleague who was 24/7 obsessed with fantasy sports -- and this was very early Internet. I told him if he spent half as much time on investing as he did with fantasy sports, he'd be filthy rich.
Bottom line: If you're at a stage in life where you can devote time to it and it's your passion, go for it. But I know at last two wonderful women who have divorced guys who got too obsessed with it.
BTW, the book Dueling with Kings by Daniel Barbisi is outstanding.