He is a serial adulterer, serial purchaser of the services of prostitutes and possibly a steroid user. It he is a juicer then he is also a cheater. He created this nightmare.
I think she should get a healthy settlement for the reasons you give, but nowhere NEAR 60% or half of such a vast fortune.
The underlying principle that the two spouses contribute equally to the couple's earnings, and therefore should be divided equally in divorce, is unrealistic in the case of one spouse with such vastly disproportionate earning power.
The same principle would apply if the sexes were reversed. If, say, Oprah had married Stedman and cheated on him with a dozen Hollywood celebuffoons, my position would be the same, Stedman should be entitled to a healthy settlement but nowhere NEAR half of Oprah's vast earnings.
Except that's not the underlying principle. The underlying principle is that both partners contribute equally to the marriage and therefore marital assets should be divided equally.
Also no judge in his right mind is going to try to put a dollar value on birthing legitimate children, they're quite happy to avoid making thankless Solomonic judgements.