If you hit something that damages your prop badly enough you won't want to drive it any further than you have to. The out of balance shake will do more damage.
All of the years I had single engine, single prop boats I carried a spare prop, spare cotter pin, extra nut, and a wrench. On one occasion I hit something in the water and limped into someone's dock. With the drive trimmed all the way up I changed the prop from the swim platform, without getting in the water. It only takes about 10 minutes.
An extra prop is nice but I would rather have it on the boat than leave it at home or at the marina.
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