Absolutely not. All you have to pay for are the 99c books you want to buy, and you pay that to Amazon. Not MM Book Buzz.
We are, however, using affiliate links. So after you buy a book on Amazon, MM Book Buzz receives a commission from each sale for up to 48 hours after the initial purchase from one of our affiliate links. By clicking on the buy buttons in the cross-promotion page, you are making Amazon pay us a commission. You only pay for your purchases. Amazon does not charge you for this commission.
In addition, the owner of MM Book Buzz, Devon Vesper, also lists her own books in the appropriate genre cross-promotions. If you buy her books, you are helping MM Book Buzz stay online.