No it is not enough reward because thralls are useful primarily as decorations.
If you do love your Authority build, then perhaps you may find it worthwhile. But for most players, this one would say no.
The Dragon powder is ok, but not worth the effort when it can be framed easier in other ways.
As for Purge triggering coins… That is easy enough to max out without storming the base here. By the time one is of level to make this easy, the coins are no longer needed.

@Mad_hornet28 The Katana mentioned, isn’t even in the main building. It’s in one of the side buildings against one of the curtain walls. If someone needs a map, @Wak4863 has a walkthrough in one of his videos on YouTube. This one thinks it is the zero-max level thrall video he takes the side trek to get it.

That’s part of the joy and the issue…
The best loot; the Katana, and (PvP only) the Ram and Explosives are easy to get without ever bothering the central vault.

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