No, it wasn’t about the price of a burger. My point was that just because you made a million dollars and your buddy didn’t, don’t start treating him like every simple, common social expense must be a financial burden for him.
I don't think a $20 burger and drink is a simple, common social expense for everyone. Certainly not on a frequent basis.
If you're curious how I handle those friendships: I invite them to dinner at my place. Much as discussed in the article.
And our friend group periodically chips in a bit so that they can make important purchases, especially health-related ones.