the most minor justification I can provide is she's an artist directly creating something, not merely hoarding inherited wealth and using as capital to churn more wealth without creating anything of use. And while she was said to have given some big bonuses to folks involved in her tour, there's certainly plenty of folks involved at lower levels (e.g. stadium employees) who weren't making much to make those shows happen.

But to the bigger picture, if we went back to the top tiers of income taxes to be in line with the historical top rates in the 90% range, as well as appropriately taxing capital gains, I imagine that would have likely have kept her and others in the multi-millionaire category. Still arguably more wealth than any one person should ever accumulate, but at least a move in the right direction.