THe problem is also that most of the kodesh teachers and some chol aren’t certified at all! they are young woman who are busy with family and need some money.
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Certification means nothing when there is dedication but you are right about the money issue. Some really would just as soon do office work if they could find it with flexible enough hours. And a few of the best ones I know of do it because they believe it is what Hashem wants them to do. They have family money and don’t need to get paid.