Earlier quoted context omitted.
I would marry someone I trusted to death and beyond, compared to which trusting with mere property is trivial. Yes, it's a risk... there's a saying about risk, though, isn't there? Let's give Mark the benefit of the doubt and assume he's marrying for love.
The couple may be madly in love today, but human emotions are fickle and people change and grow over time. Sadly, there may come a day when both are more concerned with the future of the FB empire than with each other.
How true and as anyone who has been through divorce will confirm.
In addition to the potential problem with what would be marrying simply a normal or a successful person I can't even begin to imagine the challenges of a marriage to someone with that much money and job responsibility. And no question marriage will detract from his work life (especially if he decides to have children). That even happened to Bill Gates as anyone who remembers the Gates before marriage will attest to.