Unfortunately, I think there are more teachers as you've described above than serious ones. Also unfortunately, this is the nature of the beast (the beast being the TEFL/TESOL career). Many younger teachers (right out of university) going into this field are only in it for a short time and often for the reasons you described above.
So, it's up to us serious teachers to do our best and make sure our students get the most out of the classroom.
