Any classes you take for educational purposes is usually well worth the price. Of course some factors always are of importance. For example if your in your late 80's, you'll probably never get any usage from such classes. If you plan on making any kind of future with coins, of course any informational education is always of some value. Possibly a job in a coin store, helper at coin shows, dealer yourself, etc. If you already have a set job, set career, happy with what you are doing, might not be worth the cost or time.
The worst part of any course not in a class room is real lack of participation. To easily distracted by your favorite TV program, visiting web sites or evem playing computer games.
If your watch TV lately you see a zillion adds for correspondence courses in almost any subject you can imagine. So far I haven't seen one for nuralsurgy though. The problem with those is basically the same. You finally graduate and no one cares about those when you apply for a job. For the $400 for those classes it really depends on can you afford that, do you want to spend that money, will it help you in any way, do you want to learn this subject, etc.
Each person must sit down and contimplate what any type or form of continuing education is benificial for their present and future.