Originally Posted by LóFarkas

Oh, here we go again. The weight of the bike has nothing to do with the weight of the biker. Whole different ball game.
When you bunnyhop, you don't have to lift your own weight by the pedals, and when you stand up and hammer, your weight is pressing down on the pedals as opposed to the "dead" weight of the bike you have to accelerate. 2-4 pounds is a lot.