It's likely "Ghost Rider" was actually several people who made up the Swedish Wheelie Team. One, Patrik Furstenhoff, currently has the world record for fastest wheelie. Another, Joakim Karlsson, died at Isle of Man in 2005, around the time the videos stopped. During Patrik Furstenhoff's Guinness Book of World Records attempt, he made mention of his wife/girlfriend and kids wanting him to stop taking such risks. You'll also notice the West Coast logo on the bike, the same from the beginning of the Ghost Rider movies. And lastly, while making fun of the Getaway in Stockholm videos being faked, he's quoted saying, "And we made up the Ghost Rider as a big 'you suck' to the car guys.". So there you go. That's about all that's known.
Some good reading: http://www.superbike.co.uk/blogs/ghostrider-talks-to-superbike-magazine/