I would love to go but unable so far.
Maybe Classic next year......
I love the Classic racing but would be tempted by the Main event too.
IMHO, the Classic has become far too commercialised in recent years. If you want to get close to and watch classic cars racing, my preference would be the Silverstone Classic.
The 24 Hour is the finest endurance race in the World. Again, and IMHO, so much to do, so much to watch. Absolutely brilliant.
(Also, the next Classic after this year will be 2018)