I doubt that a truly selfless act of charity exists. Even if you're just giving money away anonymously you're still probably feeling good about it and I don't think there's anything wrong with that. That's not really what my question was about.
Opinionhaver
In my case, a lot of it comes from my mountain biking hobby. I like doing unauthorized trail maintenance - sawing fallen trees off the path, laying logs over streams and mud pits so I (and others) can cross with dry feet. In winter, I sometimes ride the same trail back and forth multiple times so my fatbike tires can flatten the snow, which then freezes overnight into a perfect surface for dog walkers to walk on.
In my job, I occasionally spend my own time improving something beyond what the customer is paying me for.
At my gym, I always fill the water bucket in the sauna for the next person.
Once I also bought the supplies and fixed a hole in a fence that's meant to keep moose and deer from walking onto the highway.
It’s more about what I don’t buy - which is a lot. For most of my adult life, I’ve lived well below my means and invested everything I’ve saved. Most people don’t save at all, let alone invest.
My cousin, for example, goes on expensive vacations like the ones you described several times a year. They also drive a nice new BMW. Yet when I recently quoted them €500 for some renovation work, they asked if they could split the payment over a few months because they couldn’t come up with the money all at once.
Suffice it to say, I don’t see vacations as a sign of wealth.
I don’t think you can tell without looking into their finances. For some, a big house and a couple of new cars signal wealth, but to me, they’re more likely signs of debt and poor financial judgment.
Personally, I live in a small, 75-year-old house, drive a 17-year-old pickup truck, and walk around in old clothes that were never in fashion to begin with. Yet I know for certain that my financial situation is far better than that of the average person in my country. You’d never be able to gauge my true wealth from my appearance or spending habits.
Eh, not really. Maybe it would be different if I had a big client that I was dependent on but when working for private individuals they're not really in the position to boss me around. I can quite easily just refuse the work and leave if they start making demands we originally didn't agree to.