Having a good ear and being a musician won’t get you very far in terms of being able to identify and discern differences between audio components, and that includes cables. An analogy to your situation would be a very experienced driver who drives a mid-level sedan. That person will likely have good driving skills gained through years of real-world driving experience, but this person is still in no position to discern the finer differences between two high-performance sports cars because they just don’t have the experience nor the perspective to be able to make those judgements. It’s just a different world that is loosely related but still hugely different such that one has little to do with the other.
Its the same with high-end audio where you need considerable time and experience listening to lots of high-end gear to begin to be able to know what you like and how to identify the finer differences that are very important in the context of better audio systems. That you can’t hear such differences and you’re happy with alarm system wire is fine, but you’re still driving an economy car and simply don’t have the experience or perspective to appreciate what better cables bring to the table. But just because you don’t understand something doesn’t make it invalid, and there are tons of true audiophiles with years of extensive listening experience who use relatively more expensive cables not because they cost more or want to waste $$$ but because they actually sound better to their ears in the context of their systems. But, if you’re more comfortable living in ignorance and assuming more expensive cables are just hype, so be it. Leave your head buried in the sand where it’s apparently most comfortable, don’t strive to learn anything new, and live happily ever after with your alarm system wire. To each his own.