I had a thread in relation to a similar question when I was wondering whether I should do that which might be useful -it is pretty recent and packed with good advice from TPF members.
The other things someone once did for me when I was the highest bidder and she very kindly was keen for me to win the item even though there were a couple of days to run because she told me 'she was so stressed by the selling process and wanted to sell to someone nice and uncomplicated' was to change her listing so there was a BIN option at exactly the price I was bidding. I stood by and nabbed it the minute the revised list popped up!
Good luck