Would you move to a bigger house if you could just to have a better listening room ?

I have considered adding on, but building is so expensive now that it is easy to just be content to love the one you're with.

In a heartbeat.  

When my wife and I moved from Nashville, TN to Charleston, SC in the Summer of 2021, one major deciding factor in the home we ultimately chose was indeed the 22"X25", dedicated listening room. It even has it's own private full bath and HVAC register.. It also helped that it is on the 6th tee box of our golf course and has a deck completely across the back. My wife got the pergola she always wanted.

I like things the way they are and I don't like large listening rooms! I'd probably move to a BIGGER property size so I can have my own livestock without neighbors complaining :-)

naw, I like to listen in the same space all the rest of my life resides in. I don't want to sequester myself in a little acoustically padded cell. 

I might be odd in that I consider music to be a social thing, while listening room seem decidedly antisocial.