Possible Scam--postcard says REIClub???

I received a blue post card in the mail yesterday that uses REIClub.com as a part of the return address, but nothing else on the post card refers to REIClub. It’s some sort of deal where you get paid on houses selling at 50 cents on the dollar, though it is unclear what is required. I was wondering if anyone else has received this post card in the mail, and if anyone knows if it’s a scam or if it’s somehow sponsored by REIClub. Thanks!