If you're looking for the best secrets to make money, this might be the perfect auction to invest in. Continuing his 20-year-old practice, Warren Buffet is auctioning off a lunch for the highest bidder to support San Francisco’s Glide Foundation which is one of his favourite charities. This year's bids have already hit a record $3.5 million on eBay for charity, and will end on Friday. It took just 48 hours for the price of the private lunch with Buffett and seven friends to surpass the record-winning bid of $3.456 million of 2016. The most generous philanthropist that he is, Buffet has promised to give away 99% of his fortune.