That's just Miami, man. It's a vibrant and flashy world down there, and there are a lot of rich implants that buy those season tickets as a novelty and will gladly re-sell at the right price without loyalty to the team. There's nothing you can do to really stop it, unless Dolphins fans buy the tickets first. Cities like Philly and Boston keep their opposing team's fans out by having an urgency and demand from locals to buy the tickets, which you unfortunately won't see as consistently in Miami due to the demographics of the city. The Dolphins have a large fan base, but I think it would be a very good guess to say the vast majority of their fans are spread throughout the country as opposed to being concentrated in one metropolitan area like most other teams. You can thank the 72' Team, Don Shula and Dan Marino for that.