I know this is a long read, but...
I parked in my usual space at the arena, got out of the car and realized that there were some tailgating Mavs fans parked two spots over. They were cheering at the throngs of other Mavs fans walking towards the arena. When I got of my car at first, they said "You a Mavs fan?", to which I turned around and proudly displayed the big Spur logo in the middle of my shirt. They pointed to the Mavs flag they had stuck in the ground and jokingly said, "Should we allow you to park in Mavs parking?" I replied, "I'm allowing you to park in my lot." They proceeded to tell me, again jokingly, how they hoped that Tim would break his leg or that Pop would get shot in the face. I tried to keep things light and friendly, but the beer and the hype had them a bit too pumped up.
I was very surprised by the amount of Mavs fans there, but it was very easy for some of us to buy a group of tickets to go to the Rockets game in a couple weeks. I know the Spurs keep blocks of tickets for group sales and it appears that some Mavs fans scooped them up, along with whatever was available on ticketexchange and ebay. It's also possible that Cuban bought up anything that was available and gave them away.
At one point in the 4th quarter, some Mavs fans at the top of the balcony started chanting "go Mavs go" - it seemed that most Spurs fans were either shocked and/or annoyed that it was happening, but they certainly didn't step up to drown them out.
Unfortunately, I don't know what the answer is to any of this. How can we keep that many opposing fans out of our house?