My husband had to do a lot less to teach ESL at an American university, and his job requires A LOT out of him. Students really depend on good quality teaching to help them advance to BA, MA, and PhD programs. I would say that if you are after the money, then this is not the job for you. Some of these students have only you to help them advance to whatever careers they are aiming for. As for making money with teaching... I would recommend working in South Korea. Again, you will need your heart to be into it, but you can work for schools that already have a curriculum made for you and you just teach it. These schools pay high, and students are there to cram. They are not totally dependent on you to advance.