If my company dies tomorrow I can easily find new work or try to start a company for a year and then look for a job if that fails. I basically think of the company as a client who I get stuff done in exchange for money and I think that's far more healthy than the alternatives.
PS: I live well below my market rate and toss the extra into savings. Living pay check to paycheck when your location or skills make it hard to find a new job is simply poor planing.
If my physical and mental health are trashed from overwork, I can't pay my mortgage, because I can't work for anybody.
Me and my family first. Company second or lower. Always. The company is replaceable, my life and health are not.