I know I would love to own it, it's about time to upgrade the 2N! That being said, tractors around here are listed at the high end of what i'd consider fair. Especially fords and JDs. So I could see $7k asking and settle a bit less. Then there's the guy who thinks he has the last tractor on earth and wants 10k-12k.
I agree to just do the oil change if it needs it, but leave everything else. When I'm eyeing up a new purchase, clean freshly serviced is a red flag. I want to see the old fluids, smell the oil for coolant or gas, see the even later of dust so I can see that there are no leaks etc. the dirt paints a picture on how it was used. If it's completely caked in mud then I know it wasn't really taken care of, but a nice even later of dust tells me you do wash it, no blobs of grease, no leaks on wheel bearings, brake parts, hydraulics, etc., just in the usual spots like on rear remotes, or loader pins etc.