A double century sounds harder and more tedious to me. But I like long climbs.
Besides the danger of getting clobbered by an errant rider (not that bad really except on Ebbets where some riders going up will go over to the wrong side of the road to find a shady spot to rest, and not look up the road first to check for descending riders), the problems that you are more likely to encounter are extreme heat and headwinds on the last pass.
A lot of people really want to finish but can't. It's not that easy. Could it be harder? Well sure, and I'd be all over that. But the only ride I know that was harder, the "Son of Death Ride" was held just once. If the ride's so hard that very few can finish, not many will want to start, and you can't put on a ride if only a few people sign up.