First Mr. Clovis, :welcome:
Second, 06 ZX10R's go for about $4900 around here. That is in good condition. I don't know the extent of the damage on that one so I can't give you an exact figure I would pay for it, but to be certain it would be lower than that. How much lower is up to you. I would also thoroughly check it out before I bought it. Start it, run it for a bit, check for unusual noises,check for leaks, etc. The 10R is historically a noisy beast to begin with so that may be harder for the uninformed. I would also ride it if at all possible. Good luck.