It is up to you to determine how risk averse you are. Is it prudent to go 25-30 miles off in a single engine bay boat? Maybe, people do it all the time. Some people also ride wheelies on motorcycles and jump off buildings with parachutes. Those activities are more dangerous. I have a wife and kids, so I want twin engines and an offshore boat to go out past sight of land. 25-30 miles can be an awful long way if there is a squall and it gets rough.