Well a poop is AMAZING because if you upgrade it once it turns into The Holy, which is a 6 attack every time! But it does require that upgrade. However I think maybe some boosts might not be helpful by the end. Especially an un-upgraded one. And upgrading a boost only upgrades from 1/2 chance of it being a 1 to 1/3 chance of being a 1, while introducing the 3.