That's a heck of a price for a TZ750 (700) that can't be ridden. Race bikes don't come with titles and cannot be registered as a general rule. With 700cc motor in stock trim it would make around 90 hp and the later OW31 monoshock bikes were up around 140hp, but the cycle parts are more or less the same as an RD, so they were a handful at race pace.
We run TZ750 top ends on our TZ350s because they are so much easier to ride, and that's worth a lot. They were almost unraceable on the dirt, but on the track, I'd love to take one out for a spin. I don't know that I have the testicular fortitude or skill to run one hard, but at my slow speed, it would be fun
That bike is beautiful, but did you see what's behind it? A Konig. Probably a replica of Kim Newcome's bike. Now that is rare.