Yara said..
Was it a yacht motor or power boat? I always guessed that there would be less interest in the relatively low powered long shaft yacht auxiliary type.
Most thieves probably wouldn't know the difference between short, long or ultra long shaft motors, they are mainly interested in stealing the item to flog down the pub or where ever such deals are consummated these days.
They steal it because it is there and readily accessible and available to them for little effort or chance of being detected and caught.