It's pretty obvious that Xenia's sense of what is valuable in society is measured pretty much exclusively in terms of money. Obviously, the vast majority of people take account of other factors in their career choices: the topic of the work, the people they will be working with, commute, "social good" etc etc. The surest route to earning 500 to 1m as a solicitor is of course commercial law. Highly lucrative, but lots of people find it pretty fucking dull. They would rather earn less doing clinical negligence work or conveyancing or divorce work etc, all of which pay well but don't routinely pay as much as corporate work.
Ironically, Xenia is wrong about TY's earning potential as a journalist. He's extremely high profile and consequently can command large fees as a speaker, can write books, etc etc. He probably is able to earn 500k a year when these outside interests are taken into account (although as he's been setting up a free school, he may not have had the time or inclination).
As others have said, it's Xenia's insistence that she has the only sane worldview that makes her posts irritating. It's difficult to reconcile with her stated professional success, as megarich solicitors are usually quite good listeners and hence flexible, even if they are bullish. Blind spots are normally professionally difficult to move past.
Incidentally, what I never really understood is how Xenia can feel good about herself when measuring on the yardstick of wealth. Because if she's got the nous to be that good as a solicitor, she could have been equivalently good as a hedge fundie. And then she would have earned 10x the money, or even more.