It seems that a few players are experiencing a 'runaway player' problem with Prestige. Since it never was the case in our playtests, we think it is due to a major misinterpretation of the rewards gained by playing Prestige cards.
Playing a Prestige card never grants any Prestige points! They only give Victory points.
The 'Top Hat' graphic on each card is misleading: it is only meant to indicate that the player gaining the last Prestige card in the game gains 4 VPs.