I think you are whistling. Most bids will occur in the last few seconds. Highest bid wins, whether it is placed then or earlier. Why are you complaining about an unrealistic high bid winning? That is what you want, surely. If it's because the item doesn't sell for that it is because it was way higher than the next best bid.

Bidders can bid whenever they like. While you seem to prefer nibble bidders, sensible bidders don't play that game, as it will likely lead to them paying more than necessary.