This is true...I was a Lutheran School Teacher for 5 years befre I "retired" to stay home with our kids. MOST Lutheran schools hire teachers who were trained at a Lutheran College (of course not all of them do) But most people who go into this profession know they are not going to get rich, but want to share their faith with children. Of course, as it is with most schools (public, private or parochial) there are good teachers and there are bad teachers.
Our 4 children have all attended a Lutheran grade school and now our 2 oldest attend the Lutheran High school in the area. We send them there because we want them in a Christian environment. We love the schools and have found a nice community of people in both schools. Two years ago I was very sick and had surgery twice within 7 months and our school/church family couldn't have been better. We had meals dropped off at our door every other day when we needed it, people we were not super close to came and picked up our children and took them on play dates to give them something to do or gave them rides when we needed help.
Anyway, my point is...a parochial school and its affiliated church can be a great place to get involved in.