According to what I can dig up, the original MSRP of the DX7 was $1995. The original MSRP of the Casio CZ 101 was $395. So, by my reckoning, the CZ has a higher collector value than the DX7 based on relative price change over the years.
Edit: But also, the CZ was generally more comparable to lower-end DX synths, like the DX27 or DX9. It was a budget synth in its day, while the DX7 was the pinnacle of digital synthesis for at least a year or two after release, everyone had to have one.
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According to what I can dig up, the original MSRP of the DX7 was $1995. The original MSRP of the Casio CZ 101 was $395. So, by my reckoning, the CZ has a higher collector value than the DX7 based on relative price change over the years.
Edit: But also, the CZ was generally more comparable to lower-end DX synths, like the DX27 or DX9. It was a budget synth in its day, while the DX7 was the pinnacle of digital synthesis for at least a year or two after release, everyone had to have one.