One of my recent watches went through with no bids, I was going to put a bid on but simply forgot at the time.
It came back on this week, so I swiftly put one on and within a day it now has had 3 bids and now I'm not the winning bidder without hiking the price up further!
Two things here, one is that simply no one interested in it saw it first time around.
Another is the seller has another 'bidder' who puts the price up higher, but this time overshot my maximum bid... Who knows but unless I bid again I may never know, unless someone else steps in and the price goes up anyway.
Is it worth the gamble? I guess that's an individual's choice, I'll probably just let it go and watch what happens - all part of the research aspect isn't it?