It's fine that you have your opinions. You certainly have the right to voice them. It's interesting, however, how you routinely denigrate and even ridicule the findings and opinions of others about things you have never heard.
We have all been guilty of fooling ourselves into thinking that if someone's observation doesn't fit our paradigm of how something is supposed to sound, then it can't be real. The irony is that this is the antithesis of science and scientific inquiry. As a good friend reminded me recently, science is about humility, first and foremost. It is about admitting that we do not have a perfect understanding of the world around us. It is with this in mind that we attempt to devise a disciplined method of inquiry involving hypothesis, observation, theory and proof. And then revisit with further observation to make sure the theory holds up over time because rarely are theories perfect.
Regarding cables, a perfect cable would "do no harm" and whatever is at the input end would appear completely unchanged at the output end. Disregarding the impact of RF for a moment, the only cable that can do this would have zero resistance, zero capacitance, and zero inductance. The only cable that could approach such characteristics would be a superconductor and as far as I am aware, none of us are using such cables in our audio systems. That would mean that all cables will cause harm to the signal -- it becomes a matter of how much. As has been suggested, the fact that you can't hear differences amongst cables would suggest your system isn't resolving enough to reveal these differences or your ears aren't or both. To suggest that you know how every cable in the world sounds based on your half day experience of listening to a certain manufacturer's line of cables is rather amusing.
Regarding Jay's (AudioBacon) assessment of the impact of cables with his Chord DAVE, I will say this. With all due respect, his standard review setup (which consists of his Chord DAVE directly driving his pair of Omega Alnicos) is much more resolving and more transparent than your setup. I have had your Pass Labs XA30.8 in my home. Further to that, I have had quite a few of their products in my home for audition recently including the XA60.8 and XA100.8 monoblocks. At the present time, I have their X350.8 in my home along with their new XP-12 and XP-22 preamps just because I was curious to hear them. As much as I love the Pass Labs sound, I have yet to hear any setup from Pass Labs that is anywhere close to being as resolving and transparent as Rob's DACs directly driving speakers and Rob himself can attest to this. When I choose to hear the full magnitude of difference amongst cables, servers, etc, almost without fail, it is my setup of one of Rob's DACs directly driving speakers that allows me to hear it best.
As far as how good Jay's ears are, I have this to say. I have known Jay for a few years now. We met here on Head-Fi through PMs but we have also crossed paths on a few occasions at audio shows across the country including various Can Jams, the LA Audio Show, and RMAF. I assumed that, as a reviewer, because he does a lot of disciplined comparative listening, his ears are probably well tuned to hear differences between equipment but I didn't know just how good his ears were until this weekend. Over the past few days, both Rob Watts and Jay have been at my home in California and we have been doing quite a bit of comparative listening (including blind testing). Because a few of Rob's prototypes are involved, neither Jay nor myself will be making any public comments about what we have heard although I don't think Rob will mind if I say that we have compared (and are still comparing) the impact of various USB cables, BNC cables and even line conditioners and in my system, they absolutely make a difference. Sometimes the difference has been subtle, sometimes not subtle at all, and sometimes the difference was completely unexpected meaning had we assumed that we already knew it all and had not even bothered to test, we would have missed out on some very important revelations. To paraphrase Rob, don't assume you know how something's going to sound before the needle hits the groove.
Lastly, regarding expensive cables, we all know your stand on this and that you have no respect for expensive cables and so give it a rest already. If someone wants to share their experience with a cable with their Blu2, regardless of whether it is expensive or not, then let them do so in peace. I can't tell you how many PMs I have received from Blu2 owners about cables who have been afraid of posting publicly on this thread because of fear of ridicule from you.