This kinda reminds me of a conversation I had back in the early 90's. We had a new guy in our club who owned a company that made Ducted-Fan airplanes (Or just the fan units, I don't remember - he didn't stick around very long). Ducted fans require an engine to spin in the 15 - 16,000 RPM range.

Anyway, he was trying to get our club members interested in flying ducted fan airplanes. He started making his sales pitch to me one day and I asked him, "How many engines did you burn out last year?"

"Three", was his reply.

I just smiled and said, "It was nice talking to you", and I walked away.