Not me. You don't have to use proxy bidding. Just put in the maximum price that you are willing to pay. Ebay will only use an amount high enough to beat the closest bidder. So, you can put in $500 and win the bid at $175 just because nobody bid higher.
That way, if you get beat, they were willing to pay more than you. It is more satisfying that thinking you should have raised your bid.


54 3100 with 235
62 flatbed dump C60 with 261