I don't think $75 is bad for a bike that has been tuned up. I think there are some people who have a mentality of one bike per person. Like the Rockhopper seller specifically states she is getting a road bike. I would rather ride a quality 70's bike than a low level brand new bike. I belong to a bike coop now, and so I have someone with expertise who can supervise my repairs.
I paid $50 for my 1980's Schwinn, and while fixing it, the mechanic said that to replace it with something new that rides as well, I'd be spending $300. I originally paid $50 for it, at Goodwill. It has a Cro-mo frame. I honestly would rather ride a bike with a little wear on it, because I live in a city, and will be parking it while shopping etc. I consider scratched paint to be a deterrent to theft.
I just like to fit my bike to suit my purpose. For commuting I need a rack and fenders, If I am going on a long ride on a sunny day, I don't need the fenders. There is a gravel road through a park in my vicinity, I rode it once on my 1970's LeTour. It was doable, but I wouldn't say it was pleasant. In fact my hands were red and raw by the end of the ride.
Mary
It is MY lane!!!... It is MY lane!!!... It is MY lane!!!... It is MY lane!!!... It is MY lane!!!... ...It is TOO my lane!!!...