What do $2500 speaker cables sound like?

@jumia,
Reading your comments it difficult to ascertain how interested you are in exploring your inquiry. As several posters have wisely suggested, you can essentially "rent" /audition cables of interest via the cable company. They are very good at accommodating this type of scenario.

Select several cables that interest you and patiently listen to them intently in your own system. Trust your ears and just listen and compare in a very familiar home audio system. How do they compared with your current speaker cables. Buy some zip cord wire and judge how it matches up with the more expensive audition cables.

I believe that you will find some cables are clearly better than others (Like any category of audio products). Most expensive is not necessarily always the best but ’generally’ speaking you’ll get what you pay for. I believe that the higher quality the audio system (Resolution and transparency) the easier it will be to hear differences amongst the various cables.

This method is the most direct and effective way to satisfy  genuine curiosity.
Charles

Plus, I believe that whatever money one has spent on renting equipment from Cable Company, that money gets put in a "pot". If you decide to purchase something now or down the road, that pot money gets deducted from your purchase price.

@devilboy,
Good additional point and further incentive if someone like @jumia truly wants to sort out the issue of cable performance/sound quality. The opportunity and resources are readily available.
Charles

They sound FAR too expensive for me.

For high-end interconnects. I always go into a set of interconnects with great skepticism. Normally I will have just upgraded one or more components, so I am calibrated as to what it cost me for the component (cost per sound improvement) I just bought. So, the sound of the interconnects need to make me feel like it is worth the money... like I have no alternative.. because of the improved sound. It is always a question of bang for the buck... get the most out of an existing component, or save it for a component upgrade.

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This is why it is best to try interconnects either from a dealer or rent. Or just buy some fairly inexpensive ones that are well reviewed. Just yesterday my dealer brought by a $2,500 digital interconnect for fun for me to try (my current interconnect was $2,000 Transparent). It made my system sound bad... brittle, glasslike, not better. Did not need to do any thinking about it... it sounded terrible. This is not common, but sometimes high quality interconnects do not sound better in your system. It should not be a hard choice... it should be easy, or it is a waste of money.