UFC in Brazil

While watching MMA Round table last night, I came across a interview with Stephan Bonnar. Stephan attributed his UFC 153 loss to "Someone put something in my water." Call me crazy, but I thought it seemed like something that could happen in a rowdy Brazilian environment, so I decided to look back at the last few Brazilian hosted UFC events. UFC 134 in Brazil, Brazilians went 7-1 against other countries, including early KO or TKO wins by Little Nog, Shogun Rua, and Anderson Silva. Then, in UFC 142 in Brazil, the Brazilians went 7-1 again against other countries, including 3 first round wins on the main card from, Aldo, Belfort, and Palhares. Then, in UFC 153, Brazilians went 6-3, with early wins from Silva and Big Nog. I understand that Brazilians are typically better fighters, but when Brazil is hosting an event, and their overall record against other countries is 20-4, something is fishy. I think this should be a gambling rule, never bet against a Brazilian fighting in Brazil.