As long as no bunnies were made to cry during the production of a Tesla Roadster, I'm confident I wouldn't feel conflicted about driving one. :)
There are exceptions, of course - I guess if I was a surgeon and I would refuse to operate on somebody because they can't afford me, the ethics would be very questionable.
There's also the "all developers are the same, therefore commodity pricing is in effect" phenomenon which is annoying to encounter. And the "just tell me rate, because I know exactly how many hours this will take, and no other factor matters" phenomenon. Crazy stuff.
One good takeaway from the Lee article I had was that if you set a really high rate, even if you scare away a lot of people, all it takes is 1 client to agree to that, billing anywhere from 1 to a few hours in a given month, and you're in the holy "Ramen profitable" zone. Well, able to cover food and shelter anyway. But then you'll have tons of free time and energy leftover for other activities.
(Especially since he wrote a few others about saving endangered species and homeless people.)