Re: Why dry the hull?
Bigboat's description of the 3 types was good. I am in the second. I enjoy myboats and don't neglect them, but time is better spent IMO using them and letting them age gracefully.
Some (me) see a boat as a means to an end (or a few ends): transportation, food gathering, recreation. I focus on the end, and put more time there. I'd rather fish for an hour, or just ride around for an hour, than wax and detail for an hour. I don't care one bit what the trailer looks like, or the bottom other than marine growth that affect performance. I wouldn't even look for water spots on my lower unit.
Others, the boat is the end. All effort is on the boat, not what it does. They have boats that don't handle being outdoors very well, and have to keep them garaged, covered, waxed, vacuumed, hand dried, out of the water, away from salt air, etc. To do this, they sacrifice time using it and how it can be used ("no shoes, potato chips, sunscreen or cranberry juice on my boat goddammit") and are not much fun to be around. I wonder if at home they have a living room that no one is allowed to be in.
If that's their "end" that is fine, their choice. But one type is no more, or less, a responsible boat owner.