500K in student loans....for *one* person? Wow, that's the most I ever heard. Typically, lawyers and physicians really don't make the kind of money it takes to pay off huge loans like that during their first years in practice. In fact, many take years to pay down loans that are slightly over 100K. Funding a lifestyle that includes gigantic houses, expensive cars and luxury vacations can also be a huge financial drain.
Remember, because one lives in a such a house doesn't necessarily mean that they can truly afford it

. And even if they can afford the lifestyle, the majority of physicians and lawyers never accumulate serious wealth because they often feel pressure from society to "live up to a certain image". I'm not saying that this is your brother at all, just speaking of lawyers and docs in general.
Have you ever read The Millionare Next Door....an older book, out ten years by now I think, but a great read. In their research the authors found that of the millionaires in this country at the time...1996 I believe, only 8% of all millionaires held degrees in law and 6% in medicine. In other words, the authors found that while most docs and lawyers typically earn very large incomes throughout their lifetime relative to the majority of the population....guess what? They also spent a whole heck of a lot of it.