Think for a moment what would happen to society if, rather than seeing all the good guys get taken up and feeling like they have to make due with whatever dregs are left over - regardless of what that may mean for their lives and their kids - women could still find men of quality. PROVEN quality, because they are already demonstrating it in practice. Some might argue that this is unfair to the other men - it isn't. It provides a motivation early in life to straighten their acts up to compete properly - or to just go ahead and pursue a life of non-romantic pursuits, which isn't such a bad thing if they weren't suited to them in the first place. Also, think about what it does for a family when one parent can still stay home to raise the children, while TWO incomes can still come in from the other adults. And if one partner dies, in a lot of cases the other two would still have each other to get through it.
Not evangelizing, just pointing out that there are aspects to such a lifestyle that certainly make it nothing to frown on.