This might not be exactly what you were talking about here, but I think it is very important to remember that the "risk" is VASTLY different depending on the Dark CA. A good example would be the Fjarriagua CA's misadventures during the 2~ years I've been within it.
In the past; You were a useless dark CA if your focus was on actually murdering, raiding and generally Antagonizing people like a good little spook. Your magic was nerfed to the point of being utterly useless or outright did not work in like 2/3rds of the continent (or 100% of everywhere that people actually RP) and ANY kind of death run the risk of your character being Soft-PKed for possibly weeks, if not months (if not years).
This, in turn led to pretty much all Frost Witch operations being heavily focused on being stealthy, your ability to disguise was your ONLY viable tool for any and all spoop RP. Leading to situations that a SINGLE blood test, could undo multiple months (If you ever made it that long) of hard work. Sure, you had infinite potential disguises, but by losing one, you also lose everything you've achieved on said disguise, all connections, all property, all standings with various groups and any manner of titles if you were so lucky. Which in turn lead to the CA suffering heavily when it came to burn out and frustrations
Since, the immense risks of being blood tested were staggeringly high - meanwhile - to the person testing you it was literally costing nothing. BUT after the most recent collection of amendment that have since then fixed most of the core issues plauging the CA, thus allowing it to go on proper raids and take proper fun risks outside of disguise RP... This in turn lead to the Risk and Dangers of blood tests, becoming Tiny compared to before. Since now, the entirety of your ability to be a spook and engage with the rest of the server didn't hinge on your ability to hide away at in plain sight.
I haven't needed to bother in the slightest about being blood tested in these recent few months, not because it's harder to be exposed, but rather because the disguises themselves have become less intergral to the continuation of any schemes or RP of my character. And with that said; I see the Corcs and I see the same situation; They are so generally weak compared to other CAs that Disguise RP and all that is pretty much all they can do and are thus suffering exponentially more from blood tests than the rest of the Dark CA/MAs.