Illegal and massively dangerous if ridden anywhere near their capacity on public streets, a tremendous waste of expense for the non-suicidal. Insurance companies love them.
Usually, they last about one summer season before they are:
b)a twisted pile of unobtainium.
Now he's just a streak of strawberry jelly on the asphalt.
Crotch rockets are not always Japanese motorcycles, Italian companies such as Ducati manufacture quite high-quality crotch rockets as well.
Also known as 'sportbikes'.