In instances, it appears after a certain amount of time/drops, mobs do not drop anything.
Every. Single. Time.
And this is not a placebo effect.
There are demonstrably more drops in the first 15-20min than in the latter hour
Nothing weird about that, it's all about dopamine, and psychological status, you pop into the game, u drop items , so u keep playing, same shit is done in the casino universe, (coin machines (digital or analog)), u win = u keep playing because u want more & u're brain is entertained.
That being said, i'm not sure if they pushed so hard into aion or if this is pure imagination, but it's definitely something that can be done.
My own test are pointing in u're way : i quite often drop a gold or some items in the first minutes after logging