Amazon's "Melania" earned $7 million at the domestic box office during its debut this weekend, the highest opening for a non-music documentary in more than a decade. Documentaries are not typically major ticket sales drivers, with the majority of releases over the last 10 years opening under $5 million and grossing $10 million to $20 million worldwide, according to data from Comscore. Documentaries and concert films by popular musical artists often outperform these numbers because of their