I was looking at something similar 20 years ago the only difference being was that you had to throw doublle 6 three times on the bounce to win 10k for a pound entry.
There were, and probably still are insurance companies who provide insurance cover to cater for this market. I think the company was called Holdfast but can't quite remember.
The old favourite was in big golf tournaments that a hole in one would win a car as a prize. This was always insured against at a premium of 10%. The clever way of insuring was to get a local car dealer to put up the premium as a way of advertising and a promise you'd let them supply the car.
Sneaky. Throwing double 6 three times seems a lot easier than throwing all 6 at once when in actual fact it's exactly the same.
Brilliant.
Also means buying less dice.