Lead prizes are only given to leads that are converting at the average rate of sales. If leads are not converting at what the average sales conversions are (if it is an obvious aberration), the prize moneys will be forfeited and given to the next person on the leader board.
Sales prizes are only given to leaderboard affiliates who have brought in the average number of leads. If the leads are not in alignment (by an obvious measure) with the average number of leads brought in to create that sale (if it is an obvious and clear aberration), then the prize moneys will be forfeited and given to the next person on the leader board.