Without seeing the coach, driving it, looking over its maintenance records, and actually working every system I don't believe any of us are in a position to judge its value.
What is certain is that there are some coaches of that vintage that are absolute dogs. They have not only been poorly maintained, but over the years owners or mechanics have done some really poor repairs or upgrades that do not even come close to the original quality level of the conversion.
Those coaches are somebody's nightmare because when a new owner gets one he will go nuts trying to figure things out and making things work as they should. In addition he will be paying for the sins of the previous owners' lack of maintenance.
To me I would pay a premium to get a coach that has had well thought out upgrades and proper maintenance over its life. As I said previously some folks are looking for the least expensive and are willing to put the effort into restoring a coach to its former condition. I wouldn't wish that on a new owner unless the new owner had a place to work on the coach, had some mechanical skills, had extra money, and had a desire to make the effort.
It is almost effortless continuing the maintenance on a coach that has a history of good maintenance, especially if you have the records. But if the coach lacks records, and from its appearance shows it has not been well maintained I can see an owner that is going nuts because every time he turns around something else is wrong, and as someone new to the Prevost he doesn't even know what he doesn't know. There is a real value in starting out with a good reliable coach. How many of you current owners felt like a deer in the headlights when a parking brake diaphragm failed, or when you woke up in the morning with the coach leaned over, or your Webasto wouldn't fire up, or your generator wouldn't start?
The only way for any of us to really judge price is to touch and feel the coaches being evaluated and do a serious inspection. Then and only then can the price be factored into the equation. I would bet that if the coach were inspected, and it was found lacking the owner would either lose a sale, or be paying serious Lewbucks to correct problems in order to get it sold.