I prefer to start "big, sprawling campaigns" at level 1, because those early levels are interesting in their own ways, they go by quickly anyway, and we might as well get the full zero to hero experience, and earn all our levels.
But if its a more focused, shorter campaign I'd rather not have it be low level play because that's the part of play I have already experienced the most.
To actually answer the question, I've played with a lot of groups so I've done what a lot of different groups wanted. It probably averages out to a "Usually" or a "Sometimes".