As it stands there is no reason to add more relics past tier 3 and you get no more rewards. I had an idea so that when you add more relics after reaching tier 3 you get a discount on tier 4 pack a punch and golden armour, the discount would increase with the more relics added. This gives a reason to do so and also helps satisfy the people who think that these things are too expensive and annoying to save the points for.