Maybe if you weren't so thin-skinned, self-righteous, and narcissistic then you'd understand. You're desperately trying to make this into something it's not. The clock doesn't care about responsibilities beyond yourself, there is no division in the sport between those choosing to reproduce, those with mortgages, those attending to the challenges of lawn care, and those who have chosen otherwise. Sport is no more frivolous than anything else you do in life that isn't absolutely directly related to personal survival. Adding layers of complexity to your life to inflate feelings of self-worth has nothing to do with anybody else or with real balance.
You surely spend >10 hours/week doing someone else's bidding, trading your time and energy to help them make profits in return for what they estimate that's worth. Spending 25% or less of what you spend helping others to achieve their dreams and visions to achieve your own dreams and visions is pretty minimal. As with raising kids or any other pursuit, with running outcome is pretty closely tied to input and that truth would only be misinterpreted as derision if you aren't secure enough to accept it for what it is.
If you sleep for an average of 8 hours per night there are 112 waking hours in a week. If you spend 40 of that working, 30 more of that on family time then you've still got 32 left for various other things (commuting, watching tv, washing the car, taking out the garbage, etc.) If you're going to insist that spending >10 of that to run is a big commitment to spend on yourself then why isn't spending >10 of that to work more also a big commitment to spend on yourself? Is more money worth so much more than personal satisfaction? Balance is an individual thing, it's not up to you or Brutus Hamilton to define that for anyone else. Nobody gave you that right, you presumptively took it upon yourself.
Just face it, if you aren't willing to spend 10+ hours/week to train for a marathon then you just don't want to run your very best badly enough. Don't get confused again with that concept, that's no value judgment and there's nothing wrong in not wanting it that much. Nobody should look down on you or make you feel bad for choosing to underachieve in any endeavor you willingly undertake. It's your life and your talents to do with as you see fit, if you're truly satisfied with your decisions then why are you taking issue? On the other hand, if you don't want to spend 10+ hours/week training but still truly want to race your best then maybe the marathon just isn't for you.