1. It’s cheap
Thailand offers the cheapest reputable TEFL courses in Asia and some of the cheapest in the world. English schools in Japan, Taiwan, and Korea send their teachers here for training in order to save money.
Not only are the courses inexpensive, but the cost of living is also lower than in most countries. You can eat a meal for $1, and a decent studio apartment will run you $50 – $200 per month (depending on your location).