Nice suggestions but here's my thoughts on each.
Point 1:
Wouldn't this cause a large amount of 'load' on their servers if everyone had to login prior to the sale? Someone tech savvy, please correct me if I am talking nonsense.
Regardless, it's another feature that they (the festival) would have to pay more money for so I can't see it happening.
Point 2:
Would never work. It would be an enormous amount of effort to check multiple people with the same name are distinct individuals. Why stop at people who share postcodes? I could register at my flat and my parents house, for example.
To compound this, they will not collect proof of identification, as again, it will cost them more money to do this. Would you trust them to keep this highly sensitive data safe?
Point 3:
This doesn't seem fair. What if there's an issue with the only credit/debit card you own? Your friend/partner/housemate wouldn't be able to help in this scenario.
Some wild mathematics in here. Having two lottery tickets doesn't double your chances of winning over one? Your chances with 100 machines isn't better than with 1? Jesus.
Can only guess My Chemical Romance fans who got their hopes up this was an imminent UK tour were annoyed. Not that I'm sure if there will be one. Apparently one of their arty promo vids has Big Ben in the background which some interpreted as a sign they might come here, but then could just be set dressing.
Though at least anyone in Cardiff going to this isn't likely to be charged the batshit insane prices tickets to MCR's US stadium tour are going for.