I started because of my kids, it was another way to be involved and share with what they had going on. I play now long after they have quit because its a nice stress release at the end of a busy day and chatting, catching up with friends I have made over 8.5 years of play.
I play on and off but mostly I play because I'm bored. Sometimes the games are entertaining and sometimes it's just zapping the pets with the lab ray every day that's fun.