The reason why I chose not to enter teaching, I am not qualified to teach and I would feel sorry for my students.
But in all fairness, do "conversation schools" need you to have a degree?
For a work visa, a bachelor's degree OR 3 years of teaching experience is needed. For a working holiday visa, no degree is needed (but some employers want you to have 1-2 years of university under your belt. For a spouse visa, dependent visa, student visa, cultural visa (all of which can permit work), no degrees are needed.
Employers want degrees most of the time because they feel that at the very least they represent completion of something educationally fulfilling.
If all you are doing having coverstaion and not teaching them any gramma and such would all the credentials needed be a degree in something to show that you are educated and then converse away.
Maybe some of the qualified teachers will have more input on this topic?
Well, being an instructor at an eikaiwa is not "doing having conversation". You will often have to review grammar points, and all it takes is one savvy student asking a grammar question to make you look bad. Reviewing grammar may be simple for some, but it may also take a fair amount of smarts for others.
Conversation instructors should speak about 20% of the time (or less) in a classroom, anyway. Some lazy teachers take advantage of the situation, though, and make a classroom their own chat session, hence the misperception. Granted, I've had a few eikaiwa courses that didn't deal with reviewing grammar; they were called freestyle or open chat courses. However, I still kept my participation to a bare minimum and maintained more of a coaching and advisory role than one of fellow chatter. Teachers don't need the practice talking in English anyway; students do, and a good teacher helps them do that.