I once was in a drop auction and 5 minutes before the auction ended the highest bid was about $300. The domain was sold for $1800. I've seen another where there were no bids 5 minutes before the end but it still went for $700. More bids brings more attention to it and may drive up the price.
Also, don't forget this is an industry where people will flock to buy something and drive the price up just because someone else wants it. If others see multiple bids on a domain then they'll think it has value and bid even more - causing the price to go up. So, they sit back and watch and bid at the last minute.
You have actual bids now so it will sell (unless you have a reserve that hasn't been met).