Yes, agree. The thing is, if you should go to just one concert, as a hardcore fan you would always choose FOS I think. Going to the field and trying to get close to the B-stage would be the second choice.
Of course, there's even more young people in the field, FOS is for hardcore fans. And there are not too many hardcore fans among young people. Of the people I know, most go there just to see the legend, and these all bought field tickets as it's 2,5x cheaper than FOS. I'm pleased they at least wanna see the Stones, but my company is at the front of course - with less people I know, but with the Stones closer, that's what counts, no competition