As DSP6000.2 user, I am also very much interest in current value of my speakers too (serial 5000)

The product in the eBay link however seems to be older version (7 digits display) and all and 7,000 could be exceeding the market value by some margin.. although the sound quality and simplicity of DSP6000 cannot be easily beaten with other speaker-amp-DAC combo valued near 7,000.

DSP: DSP6000.2 MKII, Reviver,
Audio: MS200, Super Linear Power Supply 12V1A, SotM ISO-Cat6
Core+Store: ROON on ROCK