The fact of the matter is most people’s rooms are not so big that it takes a massive million dollar hifi to do the job well.
The other fact of the matter is no matter what you put in there, the room in most cases will be a big factor in determining the resulting sound. So throwing money at equipment without first getting a handle on room acoustics is not a practical approach to achieve the best possible sound.
Although, it’s also true that
1) Hi end gear are luxury items so one also would naturally expect a certain amount of visual bling as well as excellent performance, so there is that, and
2) part of what goes into judging good sound is often subjective, so anything is possible there.
The more decisions are made based on subjective criteria, more possible outcomes will result. This is evidenced by the fact that few systems end up being exactly the same and often not even similar sounding, even at "high end" shows. The only thing all the gear demoed at a high end show have in common is higher than average cost.