On the flip side, going out to dinner with friends, and discovering that you may be on the hook for $100, and not stressing about how you are going to pay for it, is withing reach of a lot more people. I have several friends who have reached that level.
I think the levels are pretty good. Though I would also add two levels of wealth that materially change people's happiness - L0 (Can I pay my bus fare, rent, groceries without stressing. L0 is very, very real). And also, L4 - which is no longer flying commercial. Being able to go where you want on your schedule, without ever having to walk through an Airport/TSA is, I have heard, a material change to personal happiness.
I find this laughable. I thought it was common understanding that business class prices were significantly disconnected from the prices that the average person pays for a flight
My spouse and I could spend whatever we wanted (your 20k or whatever) on flights to Europe from the US in business class; we could pay in cash tomorrow and not really have to worry. But we don't, because that would be stupid.
Flying business class to Europe for 10k each is not something we value.
Similarly, we don't buy steak when we go out to eat. My spouse can cook a steak from our local farmer better than any steak I've paid $45+ for. We don't feel restaurant steak is a good value. Seafood? Yeah, we'll pay for that -- don't know how to cook it well, so it's a good value for us.
There is a significant difference between price and value. Coach is a fine value for me. I'm short, and I want to give my money to restaurateurs in Portugal, not American Airlines. The pleasure per dollar is a much better ratio. (BTW, Portugal is a great value :) )
But note - I'm not suggesting that you are making the wrong decision - just that you are making it because you have to think about the cost of flying coach, you aren't at "L3" wealth and so need to think about the marginal value associated with the money you are spending. 99% of people at L3 don't hesitate for a second to book a business class ticket. (In fact, when you are truly at L3 you probably consider flying first class (emirates has awesome First Class Cabins) - or, if we want to stretch the definition a little, opting out of flying commercial altogether)
After many years of traveling north of 100K miles/year, trust me, traveling in coach sucks, and anytime I'm forced to do so I'm miserable. If I had the money, I would never, ever, take any flight > 6-10 hours in coach.
You can just as easily spend $1500 a person for a two week vacation in Europe and enjoy essentially all the same things as if you're paying 10x as much.
$5K daily incidental, are you kidding me?
Don't fly business class unless your business is paying or you're on a honeymoon or something.
There were a few reasons - there are health issues associated with flying packed into a coach seat. Employees who have to fly a lot for work, if it was requested they fly in coach, might decide to leave their jobs pretty quickly if they couldn't fly business. And, somewhat related, it's considered a "soft benefit" (and 100% non-taxable benefit by employees in the USA) being able to fly business, stay in five star hotels, and have a reasonable ($100 or so) per-diem when engaging in business travel.
When Apple started flying engineers in business class to China, suddenly they got dramatically more likely to go to work out production issues rather than trying to convince management that the issues would work themselves out. A few million dollars in employee travel was immaterial to the increase in production reliability.
Hotels run up the scale to 67,000+$ a night. That's the tipping point for not caring about travel costs not simply bounding your costs by a hidden 'within my price range' scale. Interest on 1 billion will cover a 70k / night hotel room for the rest of your life it's simply not important.
It seems like you're falling to the "Mental Accounting" [1] fallacy, wherein you create buckets of money but forget that they're fungible. You splurge in one area and cut back in another. [0]https://en.wikipedia.org/wiki/Mental_accounting