Affluence does not always express itself in a celebrity lifestyle. Having said that, Lord Pannick has a Picasso in the cloakroom of his house in Bushey, because he can. Count the Aston Martins and Maseratis parked in the Inns of Court.
Average gross earnings per barrister at Blackstone, for example, top 600,000 a year, and Pannick turns over several million a year. Most barristers earn more modestly but still well into six figures.
It is possible to become very affluent at the Bar, although, as one of my mentors observed, at the Commercial Bar you will always be a pauper to your clients. Barristers tend to be well to do rather than rich. School fees, city living, second homes, expensive hobbies, and so on, spend the money. The tax bills are large.
Crazy Jamie offers good advice about learning to manage money as a young barrister. Take the view that only half of every fee paid is yours. Set aside the rest for tax and always be ready to pay the VAT. You pay VAT once every three months, and income tax in two big hits twice a year. Start a pension early.
If you go and practise offshore (the Channel Islands, Cayman, the BVI, Dubai) you pay much less tax but the living expenses are higher.
Remember that in chambers you earn nothing when on holiday or off sick. The Bar is a high wire act with no safety net. The freedom of self employment outweighs the hierarchy and bureaucracy of employment, but comes with risks.
If you do well you can rent progressively better flats until you buy a flat or house, preferably with a non-ruinous mortgage. I bought my first flat for cash from one huge case in my sixth year of practice. The family home and big mortgage came later.
Money, fame, and all that are great, but not the only things. I left Blackstone to have a quieter life and am less busy and less well paid than I was ten years ago, but happiness counts more than money.