So you could Prince a Prince and choose not to set aside the Prince Princed every turn in order to have an automatic -$2 to Peddler every turn. Which is somehow better than Princing any other card because of some weird edge case...?
Seems like it could theoretically be possible, in a game with mostly alt-vp kingdom cards and Horn of Plenty. Like, you want your Horns to be worth a Province, but there aren't enough unique cards that you can legally play, without including Prince. But I suppose Prince of Bridges is strictly better than Prince of Princes in that case, and you need a cost-reducer in the kingdom to make this possible. Maybe your opponent Swindled all your Bridges into Gardens, but you anticipated this by Princeing a Prince? Certainly hard to imagine, but probably not impossible.