What is with people and conceding?

I get conceding when you have to leave etc but I'm so tired of playing matches that when I'm about to pull my LAST 2/3 prize cards and all I have to do is attack and they just concede... the more prizes you pull the more of the points you get. It just forces me to play more games... like I literally rush to do my last attack (have made misplaced before cause of this) to make sure I get my prizes and points.. people really can't wait the last 5 seconds can they?