Most people are not teachers because they want to do it for money, they are a teacher because it is a calling, something that they need to do. Personally I love teaching more than the concert stage, although performing is a real rush and can be great money. I enjoy being a part of someones musical journey and it is one of my life long goals to understand how the human mind works and learns piano music. It gives as a music teacher a greater perspective on life, through teaching many people from all socio-economic groups, ethinic backgrounds, age, etc etc you get a small window into the infinite variety of individuals that live in this world. That interests us greatly and getting to know how people learn and challenge ourselves to improve how the individual learns.
Of course no all teachers are like this and yes there are some who are just teachers because they need to earn money. Most of these teachers are terrible teachers, but some even learn to enjoy the work. A student can sense if a teacher is interested in their personal learning, as soon as a student senses that the teacher is disinterested, the student then will become also disinterested in the instruction. You can always ask your teacher why they wanted to be a teacher, that answer might make you have different thoughts on your teacher.
I can remember asking my maths teacher in highschool during the last week of my schooling years why she wanted to be a teacher and she gave me a lovely reason. When I asked her what score she got for her enterance into university the score was incredibly high, enough to get into any single profession she wanted to choose. I can remember one student call out, Oh my god and you became a teacher! I can remmeber her laughing at the comment, but I immediatly realised that the student that shouted it out was money minded.
I see two type of people when it comes to choosing a profession. Two main ones I see are 1) Those that choose work due to their materialistic needs/wants 2) Those that choose work due to emotional/personal needs. Of course the two may blend together, it is sad not to however have the freedom in life to have free choice (but us Westerners might have a difficult time appreciating that, I know I certainly do!) I have found that in the teaching profession generally there are more people who are in the 2nd category.
Teaching can be quite a lucrative business to be in and being in the "Age of Information" now helps this a great deal.