Today, Realms Online publisher GameSamba has announced its own offer wall, this time in concert with Guppy Media and Peanut Labs. GameSamba's press release says that the new deal "complements [its] existing partnership with Super Rewards, which not only provides free offers but also allows access to over 100 global payment methods."
Super Rewards, Guppy Media, and Peanut Labs are advertising firms that pay GameSamba for leads, in effect exposing GameSamba customers to various third-party products that they might not otherwise be aware of via surveys, special offers, and the like. GameSamba, in turn, gives Sambas (the company's virtual currency) to those gamers who meet certain requirements relating to the third-party advertisers. You can learn more about the arrangement on the GameSamba forums.