If you bid, do you lose the BFG tokens or they get returned if you didn't win?
I lose a lot of BFG because on the auction, I don't recommend you to auction if you are getting less than the value of what you are staking, do the math, the BFG token is your ticket to daily rewards without it you'll get nothing and besides auction sometimes is very risky if there is a guy who is willing to auction all his BFG tokens, my advice get as many BFG token as you can but only gamble what you can afford to lose.
That is very right. Never participated in auctions, I just let my BFG tokens to stake. It is not that much, but just let it accumulate. It is your passive income to collect those staked coins. And once BFG token is listed, you may have the chance to sell it at a better price. That is, if you don't want to stake your tokens anymore.