Why are so many people spending so much money to build “perfect” streaming system?

The simplest and least expensive streaming setup I can think of is using a WiiM mini streamer (about $70-$80) and connect to your DAC (which you probably already have).   Use the WiiM app for exploring streaming such as Amazon Music. 

@laoman

When I search for "Wagner Ring Cycle" in Roon, I count 29 album hits from the Qobuz service alone. On Qobuz, represented conductors include Daniel Barenboim (Bayreuth 1991), Karl Bohm (1967), Herbert von Karajan, George Solti (Nov 2014 performance on,Decca) Joseph Keilberth (July 1953 performance, 2021 HD mastering), Lorin Mazel, Wilhelm Furtwangler (1953 performance on Warner Classics), George Szell, James Levine (August 1994 on DG), and Zubin Mehta.

Certainly, not all classical music (or individual artists) will get equal coverage on all streaming services. Qobuz seems to be one of the most comprehensive for classical in general (dunno about Wagner in particular). And on Roon, I've seen recurring complaints about how well the search engine works (or does not work)  for finding, displaying, and organizing classical music.  The tech is still evolving, it seems.

To address your basic question of why people are spending so much money to achieve "perfect" streaming, my experience is that they don't need to.

I stream through an Asus gaming laptop hooked up to my PS Audio DAC with USB. I have ripped my CD collection to uncompressed FLAC (over 4000 discs) and I subscribe to Qobuz. I still have all my CDs. I have compared the same title/version of several CDs in my collection with the corresponding title on Qobuz through the same DAC (using a PSA transport). I would defy anyone to tell the difference between the two in a blind test. As far as I can tell, I have already reached "Perfection." I wouldn't expect the Qobuz version to sound better than the same version of a CD played through the same DAC. So far no one has explained to me why a digital WAV file would sound better after being converted to compressed FLAC, put on a server, transmitted over the internet through thousands of miles of wires and thousands of switches to a streamer, and then fed to the DAC. Where in this chain would you expect the digital information to improve compared to spinning a disc on a high quality transport and transmitting the WAV signal to the DAC through a short cable?

I've also compared my ripped FLACs to the corresponding CD (again through the same DAC) and found that the FLAC versions sound identical to the CD.

I am seriously skeptical that spending $8K on a dedicated audio streamer will make Qobuz sound better than the same CD played through my system. If someone has truly compared the two sources and found that the streamed version sounds better than the CD (through the same DAC) I would like to hear from them. I would be particularly interested in results from a blind test that confirmed that an expensive dedicated streamer sounds different than a garden variety PC. I'm thrilled that my humble PC/streamer setup can equal the SQ of playing the actual CD. I consider that a technical miracle.

One more thing. I normally stream the highest resolution version available on Qobuz so I stream a fair amount of 24/192 and 24/96. I consider this another reason to pay the subscription to Qobuz - I have the opportunity to hear upgraded/remastered versions of many of my favorite CDs. As often as not, the remastered version sounds worse than the original CD.

op you can get state of the art streamingfor 7200in an easy to use streaming dac 

the avik s180 sounds like an analog system 

best sounding  dacstreamer under 10k 

and we have sold most of the Best brands

Dav and Troy

Audio intellect  nj

Aavik dealers

@mikelavigne  first post says it all.

And one can make setup simple or complex, spend a lot or not so much. You can get damn nice sound quality with lower expenditures, spending more gives marginal increases, and then one may get past this certain plateau of marginal increases to where sound quality goes into revelatory territory.

I have well over 3.5k physical cd media, around 3.5k vinyl and even with this relatively large collection streaming has so far much more to offer, I've found SO MUCH new wonderful music! I'd have to spend multiples of $10k on physical media to match whats in my streaming libraries. And I can play all this music in stream of consciousness mode, I love all genres of music and playing a particular track may bring to mind another completely unrelated track in totally different genre, its like my own personal radio station attuned directly to my mood, and this with SQ that competes with the best of best vinyl setups I've heard in over thirty years involvement with high end audio.

IME, there is no longer any reason to even start a physical media collection, just go straight to streaming, don't divide your expenditures over various sources, you'll get to great destination sooner than later with this focus.