Are you sure about that? Link?
If its the thread Im thinking of, Im pretty sure it was just people misunderstanding his post, and he was talking about the different scents of regular ammo (akuto, FF21, FF22) all having the same phero ingredients, not regular Ammo, summer ammo, etc
I bought Summer Ammo not even a month ago and the difference in effects between it and normal ammo has been huge.