I think that people that "look" at liveaboard sized boats can be broken down into two very distinct categories.
For lack of a better descriptive term I'll label them as "dreamers" and "doers"
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Good description,
The dreamers are often found at boat shows, not meeting with brokers, which is a lot more work. When the start calling brokers, they drift over to the doers side. I really don't believe there's a lot of dreamers looking at specific boats.
Also, you're right with the dreamers having never owned a boat and no clue how they work. A good question for a broker who thinks he's got a dreamer is what boat do you currently have now? But if I were selling, I'd still show him the boat. You never know the dreamers real capability to own a boat.