I've got a 'self-sufficiency' scale. A high score would be someone riding LEJOG on their own, without needing to tell anyone else about it.
I say LEJOG, because I'm on the route, at about 360 miles, and I do encounter people like that every now and again.
The Deloitte 'Ride Across Britain' would get a low score for self-sufficiency. But it looks fun, and well organised. It's a 'consumer' event, a total package including mechanical help.
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http://www.rideacrossbritain.com/whats-included/It costs quite a lot, but I've likened some long-distance cycling to a cruise. Once you've embarked, everything is done for you, and that's the best way to look at these catered events. Cruising for active people.
I give Audax a range of notional self-sufficiency scores. The events provide differing levels of support, often within the same ride. Fast riders getting the most support, with full-value riders getting the least value.
My perfect 10 would go to someone doing a ride entirely for themselves, and me not hearing anything about them. I wouldn't begrudge them help along the way, as long as I never hear anything about it.
Curiously, I also like the anonymity of large-scale organised rides. I don't think it's any better to find motivation through fitting in, than through standing apart. It's all miles ridden.