I don't know about the original poster, but I'd have stayed teaching full time if I could have afforded it. But I was literally making half of what my students were making after a couple of years in industry.

Another thing to think about is this: Just cos you know SWE really well doesn't mean you have the ability to teach it to others. Not everyone "gets" things quickly, or will understand your explanations on the first attempt, so you must be patient. Not everyone learns the same way, nor do they have the same educational experiences, so you must be kind. And not everyone has a great home life, and has a ton of distractions that prevent them from learning, so you must be empathetic. Finally, not everyone loves to code - they just want the dollars that come from a job and will do whatever it takes to get there, including lie, cheat, and do the bare minimum, so you must be firm and strong to avoid burning out and thinking they're all terrible lazy students.

There are people who can do this. But they're rare. And even rarer when they see the low paychecks offered.