Reason 1 of 5: Teaching the Quran is Rewarding
Teachers get paid to teach students, tutors get paid to teach us new skills, but when you teach the Quran to another person, you get rewards that are more precious than any currency of this world.
The Prophet (ﷺ) said, “The best among you (Muslims) are those who learn the Qur’an and teach it.” (Bukhari)
Teaching the Quran is a way of getting a lot of rewards. As a teacher of knowledge, you are the reason that another person understands the words of Allah (ta’ala) and if He wills, you get a reward for sharing your knowledge of the Quran with other people.