Yesterday I was stuck at an auction I take part in BID which at first I thought I would join the BFG hunt but the next day I saw my BTC balance increase
I finally understood that I had sold my BFG at auction and until now I didn't know how to buy BFG at auction, can you explain?
As @dabbur said earlier, the auction is one of the ways to burn BFG, it's like a one-way exchange. You can place bids using your BFG tokens to try to win some sats, but you can't place bids with BTC and other cryptocurrencies at the auction to win some BFG. By the way, you can click on the question mark icon to see more details about the rules of the auction.