I havent seen a price for that particular one but building a twin will run you between 15-25k. They rebuild those like every two or three rides and that is somewhere in the 7k range.
The Kawasaki twins don't cost near that to maintain. The motors run basically all year. Not like the old
H-D XR750s that only get 200 miles on a crank. I expect the Yamaha to be similarly reliable.
Babe Demay has been running a FZ-07 based bike all season. Cory Texter raced it at Savannah when we were
there.