When you know not to bid

I was watching a nice little Tudor Aqua that had been sitting quiet at AUD$200 for over a week, a few bids pushed it up a little on the 23rd, and then today at 08:41:59 (AEDST), a late bidder made a bid that sat at AUD$316.

Thinks he, at 30 minutes to go,
"Uh Oh, what if somebody tries to up me, I know, I'll up my bid",
so at 11:51:23, another bid up, but still sits at $316.

"Damn, what if there's a sniper, I better make sure I get it",
so another bid seconds later at 11:51:28 AEDST, still at $316 and stays there until the end of the auction.

Was it a strategy to scare off other bidders, or a nervous Nellie who really wanted the watch?

As I see it, he made a first bid, and then later increased his top bid (original stays same as no other higher bids), and then increased it again.

Who knows what his upper limit may have been.

nervous Nellie: originally used of high-strung racehorses: in reference to old Nell, jocular name for a nag
First known use: 1926