I don’t get why, despite being more than 5 years old (and I assume selling a shed load, as they are multi year What Hi-fi award winners) there are no (that I can find through Google search) used Technics SA-C600 units for sale in the UK.
Very odd, as I’ve never known that before, so am intrigued as to why.
I think TTH’s first point holds true, but most especially for this class of product - it’s basically a lifestyle system, and people tend not to obsessively upgrade those in the same way they do conventional hifi systems - they just sit in the kitchen/bedroom/student accom until they die.