Not so sure the point you're trying to make... everyone knows this is an unofficial "standing area", the same as you get in 99% of all grounds. Would you have bought a ticket in the West Terrace and complained about people standing?
Yes you pay for a seat, but you also know the score when you buy a ticket in a particular area. I have more sympathy with the comments that people are forced to stand at an away game, as they often can't choose where to sit.... but again it's common knowledge that you may well be standing, and although there is a healthy contingent of clowns at away matches, usually you could find someone willing to swap so you can go in a more "sittable" area.
Let's face it, there's nearly the whole Ricoh to choose from... why buy a ticket in the standing area when you can sit in the other 99% of the ground.