David L. Lawrence Convention Center stated: "The Steelers don't need a mascot. Their fans are their mascot...There were Gerela's Gorillas, Franco's Italian Army, Lambert's Lunatics, people dressed up like a bumble bee. You don't need a mascot when you have fans like that. When we'd go to Pittsburgh to do the game for NFL Films we never brought enough cameras." Human resources recruiters from the natural gas industry, particularly those in the Marcellus Shale where Pittsburgh is located, began targeting Steeler bars nationwide for possible employees. Comparison to other NFL fan bases Attempts at quantifying the loyalty of Steeler Nation relative to other NFL fan bases have shown mixed results. A 2006 study by the American City Business Journals placed the team's fans 21st out of 32 teams in the league, behind all three of its division rivals in the AFC North. The study found that although the team had been selling out games for years, some fans were not actually attending the games, and Pittsburgh's weekly turnout percentage for home games was 16th in the league. That ranking was down seven slots from the publication's survey conducted in 1997, which ranked Steelers Nation 14th out of 30 teams, partly due to fans leaving nearly 10% of the seats in the stadium empty. On the other hand, a 2008 study from Forbes.com ranked Steelers fans 8th overall, citing among other things a long season-ticket waiting list. A 2008 article for ESPN.com ranked Steelers fans as the best in the NFL, citing their "unbelievable" sellout streak of 299 consecutive games. Response from other teams Anti–Steeler Nation sentiment has grown strong enough that in some cases, front offices for other teams have taken steps to keep Pittsburgh fans out of games in their cities. Instead of being permitted to buy tickets to a Chargers-Steelers game in San Diego, for instance, they were required to pay for tickets to two other games, as well. In other cases, teams refused to sell tickets to fans calling from Pittsburgh's 412 area code, and they encouraged fans who were selling their own tickets to do the same. Steelers President Art Rooney II complained to the NFL about the situation, but his grievance was not acted upon. Famous fans Elvis Presley, singer, actor Frank Sinatra, singer, Brigadier General in Franco's Italian Army Christina Aguilera, pop singer Bret Michaels, singer Garth Brooks, country singer Burt Reynolds, actor Curt