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In DragonBall, the same effect occurs. Has anybody ever stopped to marvel at the coincidence that the Red Ribbon Army never posed any threat until Goku was already at a level where he could handle them? Or why the Saiya-jins never bothered to show up during Goku's youth, when he would have been unable to handle them? Or, perhaps they could have waited four or five years, by which time Goku would have been killed by the androids already. There are isolated pockets of sense (for instance, it makes sense that Freeza would come after the Saiyajins, because the Freeza Saga occurred as a direct result of the Saiyajin saga) But largely it makes no logical sense.
Actually the progression of strength SORT OF makes sense, other than the Red Ribbon Army, but that was very early in the series anyway. The androids were created by watching the fighters, so naturally they got stronger as the fighters did. And they only beat the androids because Trunks came back to warn them. Most of the Buu saga doesn't make sense, but it was only by having Goku and Vegeta fight that he was hatched. Really most of the threats that show up in DBZ are caused by the presense of the fighters.
