What I hear, from a buyer perspective is that he has had a little work done as a youngster, but very little after that. He has not even been ridden enough to be predictable. Even though he has been on some trails and may eventually become a good trail horse, he has not yet been ridden enough to really understand leg pressure, does not neck rein and has a little buck in him. Oh yeah, and the fact that he has not been ridden in two years throws up MAJOR red flags for me. It makes me think he may have more than a little buck in him.
You may get lucky and find someone who wants a project horse, but otherwise he will be hard to sell at any price, IMO.
If he is an easy keeper and you aren't afraid of him, it may be worth it to put some more time in him. I can't help but wonder though, why hasn't he been ridden in two years?