Oy vey. A lot. My main system is in my system profile here. A lot of that turntable equipment was purchased back in the aughts, when I moved to Texas full-time at the beginning of 2017 I needed to use the big Minus K bench top isolation platform, added a second arm pod and arm, more cartridges, had a custom compressor silencer box built to my specification, and retubed the phono stage with true NOS tubes. But the biggest "investment" (I’d call it an outlay, none of this is an "investment" in financial terms) is the record collection, which reflects 60 some years of buying LPs. Most of those were purchased before the Big Bump™ in vinyl pricing, but some were rare, others sought after in the collector market and expensive even at the time (now worse, and hard to find at least in top playing condition). So, yeah, I should be "committed" but have loved every minute.