So, you have your fancard linked to 3 mates. They link back to you, but one of them also links to his dad and his cousin. Another mate links his to his girlfriends. The first mates cousin has a lot of mates, he's linked to 14 others, most of which link their cards to other people as well. All in all there are about 354* people linked in your cluster. So, if any of them is unsuccesful in the ballot, you'd rather miss out too?
*randomly made up. Without doing the proper maths, I'd think that probably a lot more people are linked, possibly close to 90%, simply because going the match is still a local/family thing.
No I'm talking about linking them for the sake of this ballot only. Forget about who they might have been linked to in the past.
For example let's say you regularly go the match with three other mates and you each had five FA Cup credits on your fancards. Last week when you all applied for the online ballot you could have submitted all four of your fancards together on the same form. Then when the ballot results are announced you either get four yays or four nays.
It would only be the cards that were submitted on the ballot application that were linked (so no chance for your long lost cousin and his 354 mates to geg in!) and for logistical purposes there'd obviously have to be a cap on the amount of cards you could link in the ballot together, say a maximum of 6 or 8.
That way you can all travel to Wembley with a ticket each or all stay at home and watch it in the pub if you missed out. It would save instances were three of you get a ticket and one doesn't. Or vice versa.