You are describing touring "festivals" not like concerts of the 80's. TWO BANDS would draw 15,000-20,000 a night. Very different. Bands who do it regularly in 2012 are bands who did it back then like Maiden and Kiss (again with 2 to 3 bands on the bill). Priest played NC on that last tour and i bet drew less than 8,000 and this was "farewell" tour if i remember correctly.
Yes, those Rockstar festivals draw big numbers, but because they have 15-20 bands on two stages. Collectively with the bands on the bill and their respective and mutual fan bases they are able to draw those kinds of numbers. Some people go to those things because of "the event" itself, like attending PP for some people. Festivals in the 80's usually drew over 50,000 an event, but were not touring festivals. US festival on the metal day drew 375,000 i believe setting a record with only 7 bands.
I am not placing any type of blame, just saying the metal bubble burst in the 80's when popularity was at an all time high and had been growing throughout late 60's and 70's. This is history and how it went down. My nostalgia is what it is of those years, but the numbers and attendance speaks for itself. it became "popular" and somewhat mainstream and dominated MTV. it is nowhere near as big as it was then. that is all i am saying, and it's not opinion. it's fact, numerically speaking based on record sales and ticket sales of the genre on a whole.
You can just scroll through those top selling metal albums and see the numbers for stuff in the 80's. and yes this probably is skewed because of accumulative sales since then, but the bulk of sales came when the albums were first released.
I love metal and have lived my life since i was 12 enjoying it went to college and then took a career in it since 1993. it is and will be my life until it can do so no longer. I am a lifer, but i am also aware of what the genre has done since my youth. yes, 30 million metal albums sold in 2011 is nothing to shake a stick at for sure and is nice to see however.
http://www.theaceblackblog.com/2009/12/music-all-time-best-selling-heavy-metal.html