Difficult to say, do you value from the list price or the ex dem prices for the more recent purchases? How do you value a 40-year-old much-upgraded turntable? Then there are the CD player and FM tuner, kept just in case. Then there is the second system. Let's say it is scarily close to my current income but as the foundation of it was bought whilst still working less so.
However, as I am on a vocational pension and mortgage-free and a couple of recent purchases came from covid saving (the silver lining to being Clinically Extremely Vulnerable) this was very affordable, but if I was younger and still paying a massive mortgage, I wouldn't have the system I have. So feel very fortunate.