TBH, I don't think Toy would intentionally rip someone off. A few members from here have met up with him and some have bought stuff and bikes from him. (One lad bought his DT 230 Lanza.)
And the stuff I said above, I wasn't trying to be mean or be a douche, but if you're selling it, there really isn't any point in going for a full engine rebuild, or even a topend. If it runs fine, sell as is and maximise profits. :)