Woodstock was not a free concert until the hippies who didn't pay for tickets jumped over the fence and the organizers just could not stop all of them.

age and/or occupation (or lack of) ain't the issue here, but how bad you wanna see the stones live. Let's imagine that one gets free VIP tickets for the world championship of curling. One might not know what curling is or don't even like the sport, but since these VIP tickets were for free, one goes anyway. and if you put most people attending the stones concert in this particular case.... the show could suck. Do I make any sense ?