Extra sets of Cables to switch up system?

Yes, and particularly helpful when testing different components and speakers it can be nice to have a few different sets around to try and compare. 

Also seeing generalized statements and reports about Cardas here, having tried at least twenty different Cardas sets per past 30  years, happy to share not one pair sounded like the other, so this for your considerations when comparing, best of luck.   

Yes.

I have two sets.

I think it means trying new wires may be fruitful, again.

I found it quite fascinating to learn about the evolution of wire and dielectrics on the Cardas Audio website. Cardas manufactures  'wire' for many of the leading audio 'cable' manufacturers  as well as for some of the most advanced scientific applications. Interesting how scientific users contributed to improving his Cardas Grade 1 copper to work effectively at less than 40dgrees Kelvin-- that's minus 387 degrees Fahrenheit! It's worth seeing his Cardas Grade 1 copper under the microscope. Commercial manufacturers such as Cardas, of basic commodities, like copper, have nowhere to hide, unlike numerous hifi manufacturers (who can and do 'hide ' behind their.............  :)

Over the years I have a number of high quality older interconnects, that were not optimal for a newly upgraded system. These are very valuable when I upgrade my system to see how sensitive the new component / system is to different types of interconnects and which flavor is most appropriate. So I have Stright wire, Cardas, WireWorld, Transparent. I run almost all Transparent now. After my last upgrade I had a pair of old transparent interconnects and speaker cables… they were a perfect match… so, I immediately ordered contemporary Transparent to replace them.

I don't, but seems like it could be fun if money is not an issue...otherwise I prefer to spend all on one great set of cables...I had Cardas a few years ago, and realized I had stopped listening to my system, so cables sure can make a difference...

I keep a couple of different sets of cables. I'm happy with what's in there, but every once in a while, or if I get a new piece of gear, I'll swap things around. Usually I end up exactly where I am currently am, but it's nice to hear the differences.