Flushing outboard motors seems to be a good thing, depending on the water where you fish. Fresh water fishermen are pretty lucky, but saltwater fishermen, if they don't flush the motor soon after usage may encounter long term problems of salt buildup. Also having the ability to run a motor without taking the boat to the lake is a plus, especially if you have done some repair work on it and need to see if your efforts were a success or tune the carburetor. Or as I do, after any extended period of not being on the water, the evening before new fishing trip, which has saved the day numerous times.