There is two aspects in this hobby:
Money and budget...
Knowledge mainly acoustics...
I am done because i cannot go beyond my budget which is very low for audio...
I am done because anyway i know how to embed in his three working dimensions any system at any price... I had learned what to do then i am done.... I listen music and change a piece of gear if one do not work well ... Thats all...
(I added a few Helmholtz resonators to my room today.... but it is only fine tuning...)
I am glad because my headphone system and speakers system gave astonishing result only because of my optimization work then i am proud... And no one change his own painting creation for a Picasso copy on his wall ...
We are proud of what we do ourselves, not of what anybody can purchase if he had the money....