Interestingly, there appears to have developed two separate HS subcultures. You have the old-timers who generally have high-school aged children, plus or minus a couple of years. They have perspectives on school, faith, and interaction that are wholly different from the "younger generation". Some of this appears to be where they are in the process (they have older children), but some of it also appears to be the result of a different outlook on HS'ing.
I think that a great many people are going to be surprised in the near future at a sudden explosion in HS'ing. Some states are already seeing it. States like Ohio that require notification already see it. Other states do not have mandatory notification requirements - they will be the most surprised.
If you want to know how well known the phenomena is - listen for shrill warnings from the liberal educational establishment. THEY know what is going on and where it may be headed.
HS'ing is becoming very popular. It seems to start with the educational inadequacies of the public school system. It then turns into a values issue - values are caught, not taught - and the people with the most face time have the most influence. For many, it also has a faith aspect - for the same reason as values.
Lots of reasons to HS. Only a few not to. What more needs to be said???