To set expectations: the Scrolls are intended to be rare so that looting them is fun and they maintain decent trade value for the duration of the event.
As with other events with rare drops that are central to the gameplay, if these prove to be too rare we will increase the drop rates :-)
In general it's a lot less disruptive to increase drop rates than it is to decrease drop rates.
Also there is a Farmer's Elixir that increases the Scroll drop rates by a significant amount. You can get one for free by doing the Daily "Legendary Liberator" Quest. Quest reward Elixir cannot be traded but you can buy a trade-friendly kit from the Elixir Store.
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