As already mentioned, price is absolutely no indication of quality.
I recently did a PPI on a car that was being sold for £35000, and indeed the body work had been restored to the highest standard imaginable, but it's nearly always the case that a restored car has had the money spent on either the mechanicals or the bodywork, rarely both and this car certainly was one of those.
However, we all know that a good body is hard to find (insert pun here) so taking into account the car lacked the soft top option (which obviously devalues it)and the requirement for some mechanical improvement I advised a value of £30,000 wich was accepted by the selling garage.
My reasoning was that if you don't mind not having a soft top you are going to struggle to find one as nice as this structurally and perhaps that's worth a premium.
I've had a customer bring a car to me that he'd just paid £40,000 for. It looked stunning, again with excellent structural restoration, but he spent another £15,000 with me before the car was right.
These two were both cars that were worth spending money on, if only to have a nice looking and reliable car rather than to make a good investment, but MOST that I see, and it's quite a few, are in pretty poor condition and IMHO not worth anything like what people are paying for them.
The one described above for example is not even worth anything like £12000 given the description.
The old expression, "you can't make a silk purse out of a sow's ear" comes to mind, but judging by some of the prices these cars are fetching I would say that, apparently, you can and many unscrupulous dealers are doing just that.
I could go on...