My whole home network uses a mix of cat 5e, 6 and cat 8 weather resistant for external runs. All with basic RJ45 plugs.
My short equipment cables from wall plates are premade with grounded continuity. Why, because the rest of the network isn’t and so it won’t affect anything either way.
Lately I’ve been using WiFi 100% of the time with Roon, and other options. No issues at all. Even DSD256 works fine on WiFi.
Have you considered air temperature, humidity, flow and charge for the WiFi signal?
All together have a significant impact on SQ 
That’s probably why audiophiles don’t use WiFi: they can’t get better air between antennas.
Au contraire! I use Omega Mart products to enhance my SQ, EQ, IQ, and DQ every day:
It was the OP’s $1400 cables I was interested in.
I use cheap CAT 6 UTP mostly with unshielded plastic connectors. There might be a CAT 6e in the wall, I cannot remember, but fixing my bad plastering did cost much more than $1,400.
Any idea why Roon prefers a wired connection?
No matter what your network setup is like, there are important factors to keep in mind to ensure you are getting the best out of your Roon experience:
Your Roon Server should always have a wired connection
If your library is stored elsewhere on the network, always ensure that both your server and storage location are using a wired connection. Avoid WiFi between your server and media storage at all costs.
Avoid connecting high resolution/high performance audio devices to Roon via WiFi to ensure optimal performance.
A wireless connection from your remote device to your server is perfectly acceptable and expected in most cases.
Wired is generally much more reliable/stable.
And Wi-Fi sounds even better!!!
I picked up a basic Silent Angel network switch a few months ago and it made a dramatic positive difference. My cables are above average but I’d consider some high end options. Just not sure if the benefit would be as noticeable.
Make life easier for support? Wireless was a lot slower 10 years ago? Whatever it is, it has nothing to do with sound quality. Roon can confirm.
Do you really expect to improve SQ for $12.99?
The sweet smell of success 
I couldn’t agree more. I added fiber directly from my router to my streamer. At the router end I used an AfterDark media converter, and at the streamer end I used an EtherRegen to convert the fiber to Cat 6, All three are powered by linear power supplies. Really cleaned up the sound. After 13 years in high resolution audio, I have come to appreciate how important network hygiene is, and the importance of using top quality gear. Hi end audio has, and always will be an expensive hobby, and high end digital even more so than analog. Those who remain in denial will never appreciate how good digital audio can sound.
“Those who remain in denial will never appreciate how good digital audio can sound.”
Ah, the cry of expense equals increased sound quality, there are elements of truth; but the law of diminishing returns always wins.
Yes, I’m a HVAC engineer 
Only but the best of gods natural air in my house.
My previous streamer had WiFi so I tried using it but it would skip and glitch all the time with anything high resolution even tho it was right next to the router. I was able to wire and the problems went away. The WiFi in that device topped out at 100Mbs though so I would expect modern streamers with WiFI specs of 5 , 6 or 7 would not have these issues. When I upgraded that streamer I went for a device with no WiFi on board so cannot know for sure - I am happy with the flawless performance over a wired connection. Incidentally I also upgraded my free ISP-supplied ethernet cables to Chord C-Stream and Atlas Equator - the cost was modest (,< $350 ) and sound slightly better as a result.
Good point For an additional small fee I can have melancholic recollections about the whole project:
Hardware fetishism.
