I think this is more due to diminishing marginal returns for the amount of sparrows in existence, to be honest...
Jokes aside, you are offering a very persuasive argument; I’d be curious to know how you figure out what tier certain values are and whether you ever have reason to (a) change your mind about said tier or (b) create new tiers altogether?
Although, if you believe it always tells the truth, then you should follow whatever counterintuitive claim it makes about your own preferences and values, no? So if God were to tell you that sacrificing your son is what CEV_(Kawoomba) would do, would you do it?