If you're cheating, then the vast majority of the sailors I've come across during the past decade are cheating as well. Last weekend, the winds on Chesapeake Bay were blowing 12 to 15 MPH all day long on Friday - it was beautiful and I sailed 50 miles down the bay to meet up with my son and his new girlfriend. While en-route, we we encountered at least 200 to 300 sailboats headed south for winter, boats from the Great Lakes to New York passed us and only a half-dozen had sails up. The others were all motoring down the bay's main channel, I guess in an effort to reach their destinations a bit faster than they would had they been under sail. Just doesn't make sense to me at all.
Now, there are situations where that motor can make the difference between life and death, and it can be a real life saver - especially when traversing a heavily traveled commercial channel. That's definitely not cheating - that's excellent judgement.