From my experience, most of people just want to try but they are not really trying
They expect to sit and ride like few meters right away
And when they realize they can't, they quit with "I can't do it"... Took me a week to ride around my house and the first tries were really funny. But it's so rewarding as you progress and push your limits further and further. Not speaking about all those children who always smile and laugh when they see me - this made my day a couple of times...