Actually, from an atheist point of view, it's nothing to treat these as tips, but China is very particular. After accepting them, he needs to give some to others (to reduce the trouble, after all, someone can help you share) or throw some horns on his way home (to avoid being entangled). For reference, after all, these are not good suggestions. Plus China doesn't have the habit of tipping (after all, it's not such a festive thing as a red envelope)