$50,000 for a game engine with no track record at all? Yeah, I'd call that a bit pricey.
That's a problem with a lot of the Engines I've seen. I can't remeber the secific engine because the website seems to have gone but they were charging in excess of $5000 for a pro license and claiming the Engine was bug free and could do all sorts. It's only when I joined thier forum on a guest account that I read the horror stories and what people really thought of the engine.
But yeah, alot are expensive and claim to do this and that but really don't offer anything that couldn't be done say in OGRE.
There was one engine where the devs kept on changing the name of the 3D Engine they sold but neglected to tell new customers that it was just a renamed engine, still a bugfest and not worth the money at all.