You'd need the attendance for a full price semi-final to make any kind of real comparison on that to be honest. The occasion was certainly a draw, but at the same time I saw people who wanted to go who ordinarily wouldn't have bothered at full whack.
I've snuck in and had an impromptu penalty shootout in front of the East stand during the summer when it was open for season ticket purchases if that counts? We were spotted by at least three different staff members too, none of them gave a crap. Magic.
I'm not sure, none are particularly limited aside from the Cov brown and FA Cup ones and there isn't likely to be huge demand. The Dortmund one maybe as they're the in thing now and it's from their tasteful luminous era: