It is just very difficult to make $10M, full stop. If you can do it in trading, you're probably more likely to do it in something else than an average person because the that kind of talent tends to be at least partially transferrable.
Personally I like the idea of getting into venture capital if I had 10s of millions to work with. Even if it doesn't make as much trading, I think it would be more interesting and more useful to society.
Venture capital is really tricky as getting access to good flow is hard.
however, lower middle market private equity is ripe for opportunities. And 10-50 million is perfect for it.

