SageBrush wrote:You thought you had caught OP in a deceit and you are very likely wrong. Admit it, apologize, and move on.
Let's try not to tell everyone what others are thinking. There is nothing wrong with telling people thinking about taking a longish survey that it may have a marketing aspect. That isn't by itself hostile.
My take on the survey is that the assumptions - especially the financial ones - are too rosy. Since this about a hypothetical battery swapping business that isn't a big deal, but if the actual costs were substantially higher than listed, then the participation rate in such a service would be quite a bit lower.