It's safe to say that if you don't hear any difference on your current system, then you shouldn't upgrade your cables.
You might find that on a different system - not necessarily any "higher end", you do hear very significant differences between various cables.
That's my experience - a long time ago, I tried a few different cables & concluded they all sounded more or less the same. I concluded that cables were just another way for dealers to make profit. Only many years later did I discover that cables can make a real difference (sometime huge) on many systems that even my 50 year old ears can easily appreciate. For me, it seems that the more transparent the speaker, the fussier my ears are about the cables.