EDIT: Scaling XP bonus actually on. Tested with Iksar SKs. It is just not noticable past 30ish because at that point its only .5% more. Word.
Or maybe I am bad at maths. I am getting 10% per decaying skeleton kill at level 1 on RED. I am getting 8% on blue. Same mob, class, race, zone. Wouldn't I be getting 16% if scaling bonus was on since it would be double xp at level 1?
Screenshots will follow in a few minutes. I just conducted this test.
The Test Subjects
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The results:
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