Yes, I understand that, but aren't you now enticing the very early travelers (before 7:15 am) to delay their departures to quality for the discount and potentially creating more congestion during the "early bird" period of 7:15 - 8:15? I can see a lot of people waiting at the MTR gates until 7:15 hits before they leave, possibly creating more congestion. Why create a situation where people who use the train at the slowest time (6:00 am - 7:00 am) are encouraged to delay their departure? They should get an even bigger discount.
I understand your explanation, but it just would seem to make more sense to give everyone who gets up early the discount. I feel sorry for those people who travel very early and pay more than those who travel later. Seems like a typical Hong Kong senario where bean counters get in the way of common sense.
Of course I do realize the MTR is a private, for profit company and all that. T