It might have something to do with the base level of the staff (the level which requires the most ordinary staff of this type without any bonuses), then you would get mostly staffs of that type, which has the base level nearest to your level and the more difference between your level and staff's base level, the lower chance to get it.
Not sure about it, it's my theory.
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Blaine (barbarian), Lyra (hunter), Naku (warlock), Bivoj (knight), Yu Niu (conjurer), Radegast (marksman)
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