10's on $5,000 ?

They will tell you how the values have come up especially for rust free examples.

I have several F bodies and I watch the FB F body sites. Here in Tx rust free example can be found occasionally, drivers for $1000-1500 rust free, or little rust, slant to 318 RR, NO superCoupes though for that! They are scarce in Tx but more pop up in the populated states. I have seen their value rise in the last few years I agree.
I have a rust free 318 complete 77 Volare wagon I gave $500 with a perfect ($3-400) grill, complete non runner. It hasn't sold here priced at $500 with a broken but repairable grill!!! lol .... IF it was a Chevy!!!!!! lol
For a fact, nice examples of 2 door Aspens/Volares/Diplomats/Lebarons/Mirada have soared in price. Especially in my part of the country. We can still land a 4 door version that is a solid good driver for around 1000-1200 bucks if a guy has patience. Of course, all the rust free cars that folks have been talk'n about are ALWAYS 1000 miles+ away.