For the life of me, I cant understand why ebay bidders will nickle and dime an auction up every few hours with 5 or 6 days left in the auction. It just keeps going and going up.
I hear ya!

If it's a newbie, I will occasionally send them an email and politely explain the goofiness of their actions.

I'm always surprised to see seasoned eBayers bidding early. I guess they have deep pockets and figure they can scare of the nibblers.

Still makes no sense to me. Why give your competition the better part of a week to convince themselves to maybe go a little higher?

Give them no time at all.