One problem is few outside the former Eastern Block will appreciate that the Erconar is, essentially an East German VEB Zeiss Ikon camera. Also the Tempor shutter is relatively unknown by most of us.
In terms of pricing I can easily find an Ensign 820 Selfix. in excellent condition for around $100, very similar specification. While these cameras are very capable they are not desirable of the 120 folders.
I bought a Zeiss Super Ikonta 533/16 a couple of weeks ago (
@moggi1964) will guess who from) for £40 (under $54). It looks like it has hardly ever been used. Shutter is accurate at all speeds, has a rangefinder, and light meter, both work perfectly. OK the focus was solid & wouldn't budge, but was a quick fix, optics - the Opton Tessar - is like new.
In this case the 533/16 is a keeper & a camera I will use, for the same reasons they sell easily, the Automated film wind, no reliance on Red windows, and the extra feature like the Rangefinder & Meter
However, having a camera refurbished, restored, serviced, can be almost as much as a possible re-sale value. That's speaking as someone who restores, repairs, and services cameras, but I specialise in Wood & Brass, early roller blind shutters.
I have had cameras I've bought serviced, but then used them for a few years use, before sold them. The reliable use quickly recoups the service costs.
Ian