There's GREAT financial compensation and I only do #4 days per month .You do what you want but understand that you're under no obligation to help people learn how to shoot unless they pay you.
Being an NRA instructor isn't like being a doctor (with legal responsibility to provide aid).
Something I think about every single time I step onto a private or public range : In AZ. some years back now a young lady accidentally shot and killed an instructor ( CA. National Guardsmen ) ,while firing an Uzi . That could have been prevented had the instructor been behind her , instead of too her side .
She was 9 years old and Chuck Vacca should have known better !. So IF I can prevent anyone else from having an unintentional shooting incident ,I'll make the effort EVERY TIME .