I’ve got an 88 C4 vert myself. C4’s are kind of at the bottom of their worth/value right now and prices are just starting to climb.
Great perfomance per buck value, but not something considered overly “desire-able“ yet.
Your 94 would go for around 11-13 grand here. People are asking stupid amounts for them, but they only sell around that range, sometimes less. Condition is paramount to get a good selling price on these “want” cars.
I bought my 88 two years ago for a little under 9 grand:
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Had a few issues I could easily fix (broken plastics, wonky headlights, roached master cylinder, etc), so we got it a fair bit cheaper than the asking.
Would likely sell around 10-11 now, assuming you can find someone willing to part with the cash for a two seat sports car.
Thankfully, we don’t deal with smog certs here…