I'm going to chime in with a repeat of most of the comments here. I love teaching, think I'm pretty good at it, but often feel run down. I do a mix of curriculum development, teacher training, teacher management, classes at businesses and unis, and my website... all in an attempt to earn enough money to pay my mortgage, put food on the table, and stick a little (and I mean little) in the bank.
I'm hoping to begin earning more money through my website, and develop a few textbooks in the future. But, really, that's all speculative. I'm of the opinion that you stay in the business because you love helping people.
Or I could just write, produce, and star in a movie or TV show on EFL teachers!!