Hi,
From my experience in the industry, although I´ve just started as an affiliate, depositing options are the main issue in latam. If you are planning on investing I´d recommend not doing it. I currently get a 75% of spanish traffic and a 25% of SA traffic and I haven´t managed to convert a single south american user. They register in mass to any free cash offers but never convert to real money players. I don´t know if it´s any better in Brazil as all my sites are in spanish, it might be worth a try.
Cheers.