Some people have a pre-conception of what it is like based upon a twenty year old experience or whatever.
I definitely agree. When we first purchased DVC 9-years ago, I was working with someone who had only been to Disney World once in her life, back when it was only the Magic Kingdom. So that was still her whole perception.
I tried to explain things but a lot of it was like talking to a wall.
About 5-years later, her daughter and SIL were going and invited her along. The chance to vacation with the grandkids was all it took.
When she got back she couldn't believe everything she had seen. She knew Epcot existed, and MGM, but didn't have any feel for them. Plus the expansion in the whole area inclucing DD, water parks, hotels, PI and so on.
But even after that trip, her accommodations experience had strictly been a DVC hotel (one of the moderates I think, or possible one of the Value resorts), she still could not fully understand the DVC concept. Face it, without someone actually seeing the DVC accommodations, they'll only compare it to their own experiences. Usually that's a hotel experience of some type. Also since she had never stayed in a Condo of any type ever, she had no understanding of even that.
Of course we all know that comparing DVC to a hotel is strictly apples to oranges, and even comparing to other Condo's is....well, just not the same.