Before the auction ended, bidders were told they would be treated to a rock star lifestyle for a day for pledging the highest amount.
The advert read: "Want to be a rock star for a day? This is the experience you never dreamed money could buy.
"You and your guest are headed to Metallica headquarters in San Francisco. Here you will meet the co-founder of one of the greatest rock bands of all time; Lars Ulrich.
"Lars will begin your unbelievable day with a tour of Metallica headquarters, which includes Metallica's recording studio, rehearsal space and home of their fan club. Once inside the studio, you will have the privilege of receiving a one-hour private drumming lesson from one of the greatest drummers of all time.
"After Lars shows you a thing or two, you and your guest will join him for a private lunch. Almost too extraordinary to believe!"
The 46-year-old drummer's gift was auctioned off during the Grand Slam for Children benefit gala at the Wynn hotel in Las Vegas - which eventually collected over $8.5 million with the help of global stars.
Trip is a young and inexperienced roadie who is charged with the important mission of...
We deal in irony here in Britain as our default mode, so it should be...