If for no other reason, Freerolls are always worth it simply because you get the practice of playing. Just like driving a car you have to get behind the wheel to learn, You will never learn to drive, playing GTA on the computer,
Un-like Poker where you can learn a little sitting at a computer. because there are a big difference between Virtual games and Live games, but all games give you a little bit more experience.
Yes I will admit at one time or another I have treated Freerolls as an All-in Fest when for one reason or another I just want to bust out and do something else, or I have just shut the computer down and sat out for the entire game, but things happen in the Real World where it is not always possible to devote any time to a Freeroll.
When I am the right mood, and have time on my hands I will approach them more seriously, as I have for the last 10 years since retiring, but when I was working anything could happen to stop me enjoying a game.
Poker is Fun! and when it stop's being Fun, I quit!