What gain would Professor Anthon have had? While Joseph's experience told him that there were many who wanted the plates because of the gold in them, it is more likely that Professor Anthon would have wanted the plates for their antiquity and the academic honors that might be associated with the translation of an authentic ancient American document. Nephi understands that there are more ways than one to get the glory of the world. Whether we sell our souls for money or sell our soul for acclaim, we have purchased that which has little value with that which is of incalculable value.
Veiled in this description of the intent of the "other man" is probably a continued indication to Joseph Smith that he too should avoid such temptations.