I don't know if Adam and Eve ever existed, but I know for a fact that even if I knew the worth, I would still taste the fruit.
Just think, earthly life is full of joy, of pleasures. Answer yourself honestly, would you give it all up to go to heaven and walk in the Garden of Eden? So, if the Bible is believed, expulsion from Paradise is not a punishment, but a divine gift. Have you ever thought about that?