Your 1st public event of each day [b]always[/b] rewards you with either ascendant energy, shards, strange coins, or maybe even a mote of light (not sure about that one). After that, you have a [b]chance[/b] to be rewarded.
Gold Tier gives 15 or so Vanguard marks.
Silver gives 10 I believe.
Bronze gives you only 5 or so marks.
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I know about the first one. The problem are the others.