1. It is surprising fun. It is a good workout and for more control in wet and slippery conditions.
2. Reading about Sheldon Brown's exploits on a hotted up Raleigh 20.
3. I've got around 17 bikes, including a very nice vintage road bike, 2 recumbents, several vintage English three speeds, a couple of folders and a cheap, heavy rigid MTB. Just Because.
4. I ride with at least one brakes on all my ridable bikes. I have a very old track bike to restore that has no brakes.