No, it´s not! A car, you can rent from 9 000 - 12 000 baht per month. That would only be 300 - 400 per day. As a taxi driver you can easily make trips for 1 500 per day. Let´s say that 900 goes away including rent and gasoline. I would assume it is most India and other Asian nationalities that are doing this. They will be quite satisfied to have 600 baht or more per day.