The values forum is useful for some bikes and brands but not others. That is only natural as what is both popular and still around in numbers will pass thru everyone's hands more often.

I would hope that an active restorer/flipper of steel road bikes could accurately estimate what a 1981 Schwinn Le Tour, an 85 World Sport, or a 77 UO-8 is worth in their area, given condition. And by accurate estimate, I mean give a range of 15% +/- the sale price.
These, and many others, are common bikes that one both sees for sale and sells.

Raleigh, Schwinn, Peugeot, Miyata, Univega, Nishiki, etc etc etc are all common enough to have an idea and to offer up a guesstimate.
Torpado?- Cant say I have seen one for sale on the local CL in...ever. As such, I wouldn't offer up an opinion if I came across a thread asking for value of a Torpado.