I would that we could all see sin for the beast it is, that we could smell and taste the death within which it abides. Christ having paid the price for the sins of man, these sins are not laid to his charge anymore. As far as the East is from the West they are removed from man. God no longer sees the sinful nature of man, but the righteousness of His Son. I believe it is error to see all standing before the Judgment seat of the Lamb with a book opened and by date and deed the sins of the past repeated to a sorrowful saint standing in that glorious Presence.
Sin can remove from that heavenly treasure just as obedience adds to the account there.
I do not know what the significance of these crowns of reward are in the new earth, but they are much to be desired. Scripture mentions five that are given by name for the righteous actions of God's people. They are individual awards, and another cannot add anything to your heavenly account. As with all things the price for sin is more immediately paid on earth in human misery. This misery we see from one side of the globe to another as man's inhumanity to man rules supreme in this world.