Steven,
One thing I noticed when trying to buy my plane is that although an individuals plane is listed for sale, it may not actually be 100% for sale in his heart. Hesitation and being difficult are sometimes traits of someone who may not be flying much anymore and know they should sell the plane but when it actually comes right down to it they can't bring themselves to do it. They make it OK with themselves that they haven't sold the plane buy telling you and themselves that if someone won't meet my every demand I'll just keep it. I ran into two such people. One was a doctor who knew he was going to loose his medical but really loved flying and the other was a guy who only flew 10 hrs. in the last 2 years. But, for whatever their reasons are, you won't be able to meet their high expectations or demands and you are merely wasting your time. If after reasonable attempts to compromise have been made and you seem to be getting no compromise in return, you might as well walk.