greater exposure brings new blood to the genre and it also brings an influx of posers. you need to balance the two, obviously. there needs to be avenues for newcomers to reach the underground (like mainstream radio) but we don't want to saturate society with it.
I concur...it's always a risk when you stretch beyond your limits to greater - for lack of a better term - "accessibility," but there are still just as many genuine, interested newcomers to the genre(s) and movement(s) as there are posers. After all, Beethoven had total faith and optimistic hope in the beauty and value of his art that it would be appreciated by those who could appreciate it for what it truly is...even if it was after his time. Same with extreme metal. If you have faith that the integrity and beauty of like-minded musicians/composers will maintain their artistic beauty and honesty, it will help with the extreme music of extreme metal to filter out newcomers who are "wannabe's," "posers," "imitators," etc. from the true, decent, genuine and sincerely honest converts who voluntarily wish to become a part of this art and carry it onto the next generation
After all, you can't make people aware of say, for example, Gorgoroth as a legitimately good black metal band if it's always TOTALLY HIDDEN from but the slightest human contact. If you expose it, people will notice it - some at mere face value, some for what it truly is. But it's a risk we have to be willing to try and take.