User blog comment:ClariS/FEEDBACK! Cost Efficiency/@comment-12443575-20130911105157

Nah, everything is just fine. Calculating stat costs with the cheapest, lowest tier possible items makes most high tier items overly cost effective, but that's the whole point of buying higher tier items. And there is no use calculating average stat value of all basic tier items, because not only we will end up having all the cost efficiencies messed up, but it will also become harder to calculate and it won't tell any better if an item is cost effective or not.

And about %movespeed: cost efficiency does not determine how well an item synergizes with a character. %movespeed bonus means less to chars with 325 movespeed and no boots, and more to chars with 355 base movespeed + Boots of Mobility.