The only reason is for the EUA upgrades for elites the cost is the second tie breaker. If there are not enough FC for all the silver elites in FC, then date of purchase decides. IF...IF there are 2 silvers with the same date of purchase , then cost of ticket (most expensive). The ONLY time I could imagine a tie would be for day before of day of purchases. If you are buying more than a week in advance the probability calcualation to create such a tie is huge. Save the money.