A few years ago I was privileged to watch a handicap race at Oulton park featuring a range of single seater cars from different eras. It was only a short race of perhaps 6 laps with the fastest car setting off nearly a lap behind the slowest! It all came together over the last lap and was a great watch.
Wouldn't it be great to have a handicapped F1 race. It would be dangerous to have all the cars handicapped to the point that they all converged on the final lap - but setting the handicap point 5 or 10 laps from the end would provide an intriguing spectacle! Cars could start from the pit lane at intervals - Marussia's off first with the Red Bulls last. Throw pit stops into the mix and it would be quite a spectacle. I'd certainly pay good money to watch such a race.