I'd tell the O.P. that 'diminishing returns' are part of the difference between a 2k and a 50k loudspeaker, assuming he'd understand that the 50k can sound better.
By the 'tone' of his question I think he may be just irritated with folks who can appreciate and afford better models. He might enjoy some high-end speaker bashing, don't know.
Accept diminishing returns and buy only what you can hear. If it's a tin ear then the $2k may satisfy for a lifetime. Some are so well-designed they can. Still, I'll enjoy a Tidal Audio or Rockport or MBL, etc, far more than a cheaper pair.
For me @jhiller has is exactly right. Don't own a boat or snowmobile, don't need fancy new depreciating cars (some good used ones can be fun, eg Miata). Putting money into a hobby I enjoy every day makes a lot more sense.
Perhaps the O.P. should venture out and hear some world-class designed loudspeaker and he'll get it figured out.