This is honestly quite accurate. Everyone has a threshold that they will operate within if it serves as a means to an end. Of course, not everyone has the luxury of being able to make the decision between multiple opportunities offering various types of environments, conditions, and compensation.
I have some friends who are generally pretty miserable during the week because of the expected long hours that their careers require, but they tolerate it because they're young, have the energy to get through it, and are paid handsomely (allowing them to have the fun they want, buy some flashy things, and still save considerably) with the expectation of future growth - another important factor to consider. These people, like many others, work along the lines of the saying 'short-term pain for long-term gain,' in other words, they'll put in the hours, earn their stay, and use the present as an opportunity to build upon their foundational knowledge knowing that what comes next is worthwhile (i.e. their future selves won't have to work such long hours and will be earning considerably more).
@Neroon, my question to you is, finances aside (not to make too many assumptions, but it sounds like you are doing ok) do you see yourself progressing professionally? Do you feel like you're hitting a wall? You mentioned you've been in this field for 15 years, how has your compensation for your experience changed over that time? Has your relationship with money changed since entering the field? Have you largely spent it with one company or multiple? @CerealExperimentsLain said it pretty well in mentioning the value of coming home (or signing off if you work remotely) and being able to look back on your day without feelings of disdain, or even worse, the feeling of "I can't believe I have to do it all over again tomorrow." Your mental well-being impacts your ability to perform your job, and if a company that you work for does not care to acknowledge this in the form of ensuring adequate staffing or other factors, the one you are hurting the most is yourself. On the bright side, it sounds like you already have a solid understanding of the type of environment you want to be in.
For what it is worth, I am one of the people who are willing to accept a slightly lower compensation than some of my peers in exchange for a great work environment - which is true, I made that decision and live that reality now. And yes, this would obviously change if I wasn't making enough money to sustain myself and the lifestyle I've grown accustomed to. After all, if your chief concern is ensuring you have food to eat and a safe place to sleep each night, your attention should be primarily focused on increasing your income despite your feelings about the workplace. Cover yourself now, and worry about the rest later. But for now, it sounds like you are a step or two, or a few, beyond this concern, and are more concerned with fulfillment and joy in your job. If this is the case, and your current employer is unable to offer this, it might be time to find another opportunity.