Almost every single one of my students will earn more than me, once they graduate. I will be very happy for them. I will be even happier if they are happy in the job that they find or the business that they start.
Teaching is a very poor profession to choose if you want to make money. Since, I chose this profession, I don't put money very high on my priority list. So, in one sense I couldn't care less how much my students make. All I want for them is to be happy in what they do.