"Essential bills" as you put them can skyrocket at a moment's notice no matter how frugal you are. I watched my mom battle cancer for 10 years before she finally succumbed to it, and if my dad had had a lesser job it would have bankrupted us as a family. Furthermore I've seen said medical bankruptcy in some close friends, and that's just one of many things that can and do inevitably go wrong in life even for the best people. "Average" can turn to "destitute" in a matter of weeks.
My goal is for my fiancée and I to have enough in the bank for our future family to afford the best available solution to any problem we might have. Car gets totaled? I want to walk into a Carmax and come out with a $10-15,000 replacement the same day. We have a kid with special needs? I want to be able to afford the best teachers and schools there are. I get in an accident and have to go on half-pay for a few months? I want rent/mortage, groceries and other necessities taken care of. I'd also like to be able to afford 10+ years of medical care in my senior years and not risk going bankrupt.
Granted I'm only 29 and healthy with a good job, and my fiancée's working on getting her career started so we've got plenty of time and opportunity; but damn straight I'm going for millions, and I'll happily work 60+ hour weeks for decades to get there if that's what it takes. I'm not above taking vacations or breaks or weekends off, and I don't kill myself. I eat well, sleep well, exercise, have date night, etc. But I don't play nearly as many video games as younger me thought I would. :) It's worth it, and I sure as hell won't be squandering the effort on multiple houses or fancy cars.
