It's perfectly sound logic: being already married is social proof that you were a good enough mate for at least one person to marry you. If you had to pick mat

It's perfectly sound logic: being already married is social proof that you were a good enough mate for at least one person to marry you. If you had to pick mates blindly, that wouldn't be a bad way to do it. There is a special reason that we don't apply that heuristic to marriage candidates in real life. We typically value loyalty very highly in a mate, so married candidates who would leave their mates for us destroy their own value. The same is not true of employees. Loyalty is a nice-to-have, but competence is essential.