Family wealth is probably an indicator for future success. I don't know the numbers, but I would expect family wealth to correlate positively with the earnings of the children. So if you want a return on investment, it makes sense to bet on the wealthy.

But I thought we were talking merit and opportunity? No, being a banker's son doesn't predestine you to being more skillful. You should already have enough counterexamples to demonstrate that fact.

Your comment is borderline bewildering. It's like corruption and nepotism don't exist.