If I actually WON most of the coins I bid on, I would have been a world of hurt back in 2014 and earlier when I actively collected. I would probably still be digging out of that hole. I remember breathing a deep sigh of relief when I would get outbid on 98% of coins at the last second. Do people actually want to WIN the bids? I was doing it wrong!
Waiting till the last couple seconds. From my own experience putting in early bids generally carries a risk of increasing the items final price by a small percentage. The only exception to that is a seller listing something really high and of course I have bid on items where I'm the only bidder. It's all items. Occasionally I list video games and pretty much the same fees apply to them.