Most likely they assume that the builders know how worthless it is but they think the customers will not, thus being tricked into buying this car to only save $

Most likely they assume that the builders know how worthless it is but they think the customers will not, thus being tricked into buying this car to only save $50 a year. A solar golf cart would be great for people in Arizona, but a car with a solar roof is meaningless almost anywhere and actually wasteful everywhere that doesn't have great sun.