Re: Please allow us to bank 4,000 tickets.
Do you know someone who doesn't benefit from this idea? Me. If I want all four copies of an event card without spending gems ('cause I can't watch ads to get them for free, so those shinies are really precious to me), then I must win at least 3 multiplayer games every day (though not consecutively as I have to wait for a four-hour refresh on the booster), complete all seven challenge missions, and then win three more multiplayer games with boost or gather a smattering of tickets as I complete quests.
And I think that @Clarent1975's idea is fantastic for those who can use it.
First, despite the post's title, the proposed banked amount has been dropped to 2400 tickets, two event cards. You don't get the two event cards for free as you must still earn them. Want to get next week's event cards as quickly as possible? Play hard this week to bank those tickets! (I'd also like to suggest that banked tickets are immediately applied to a new week's event card... can't skip out of any less than stellar cards. 😉)
@Islar74 raises an excellent point on whether banking would impact the number of players in the multiplayer arena. The most telling statistic would be how much people keep playing multiplayer even after they've accumulated all four event cards. Certainly people were playing multiplayer regularly before tickets were introduced, so I'm sure that it's not everyone's only incentive for friendly online play.