I originally thought so too (and why Stormreader started out at 22 nora instead of 30), but the thing is that in terms of actual gameplay, some things are missing from the Pro/Cons list - and after some adjustments, it went up to 30. Primarily, Stormreader is just much burstier in many situations. You can actually get +16 DMG onto the target that you already just damaged before the opponent can do anything about it regularly, while in most situations, half of the output potential of Ping is controlled by the opponent. It's true that Psychic Ping is less restrictive in terms of deck building, but if you are running Stormreader, you build around it. Lastly, this is also one of those cases where it's probably more important to consider the unit's cost as much as the ability's. Sure, maybe Stormreader should be 20 or 25, but we need to consider what happens to the champ's cost as well.