Considering that the so-called "Wraith worshippers" are just hanging around like that, walking around not being eaten by their supposed Wraith overlords doesn't that seem odd?
The Wraith not feeding on them, just makes me suspicious as to who they really are. I mean... since when have the Wraith ever been truely "nice" to a human being (besides Michael)? They always either try to eat us or trick us.
Here's my little theory based on some known facts about the "other" villains in the Pegasus galaxy.
The so-called "Wraith-worshippers" are really rogue Asurans (not part of the main Asuran populace who want to destroy the Wraith after the Wraith War). Asurans are beings made from advanced nanites similar to the Human-Form replicators. Meaning these guys are un-edible for the Wraith. Sure they could be biological beings as well; that is assuming that the Nanites are inside cells instead of the Asuran being made up completely of Nanites.
Either way, the Wraith can't feed on them...
Think about it, the Asurans were the result of Ancient experiments, much like the Wraith.. but they were made to combat the Wraith. When that failed and the Asurans evolved, the Ancients decided to destroy them completely, aka commit genocide against their Asuran creations.
As the saying goes... "The enemy of my enemy, is my friend"... I think that the Wraith and some of the Asurans allied. The result is that the rogue Asurans work like the Asgard aboard the BC/DSC-304s. But, NOW not every Wraith Hiveship has their own compliment of rogue Asurans. Back then, they probably did.
Anyhow... the Asurans worked along side the Wraith and probably gave them superior weapons that would break down after a time. Which is probably why the Wraith tech seems to be degrading and the Wraith themselves are unable to figure out how to repair them.
I think that after the Wraith War when the Ancients retreated, some of the rogue Asurans aboard the Hives fought their Wraith and somehow were killed. Thus the reason why not all Wraith ships have their so-called "Wraith worshippers". The other rogue Asurans could have struck up a deal with their Wraith buddies as they hate the Ancients as well as the Ancient's favorite creations... us Humans far more than they hate the Wraith.