Ehh, cuz there's better ways than just weightlifting to stay healthy. I've been doing more cardio and HIIT just in the last two weeks, and I'd recommend running when possible. It's just better to be healthy all around than the jacked guy who can't sprint 200m to save his life, or move 10+ miles in a day (zombie apocalypse). Hubski is all about improvement, no doubt, but more towards intellectual, even some spiritual improvement. Sources of those such things are harder for me to come by than a barbell or dumbells, so, here I am. :)
b_b is always touting the benefits of weight training, and for good reason. Nothing selfish about lifting weights, it's good for you. We all do things that take up time that could be allocated elsewhere, at least yours is good for you.