I have a friend who bales them- I help him every fall. He has a LOT of trees- probably 40+ big oaks around his yard- so baling them is the best solution for him. He uses the bales for his garden, and gives some of them away. He uses a hay baler, and we rake the leaves into the chute (it doesn't pick them up like it does grass).
Those bales weight 120+ pounds a piece, and have a LOT of leaves packed in them. I would guess that an 8 foot pickup bed couldn't hold all of the loose leaves that would go into a bale, and he gets 75-80 bales, every year.
It isn't for everyone, but it works well for him. It takes about 6 hours to blow the leaves into wind rows, bale them, then load them on a trailer.