I agree with Michelle - it's an auction, go ahead and BID. There is nothing wrong with doing so, and noone here should get upset because someone else bid against them, even at the last moment.
And I too have bid late, because I won something else from the same seller and want to optimize my postage.
But I do understand the frustration, I have come home from work thinking I may have won something (was the high bidder when leavimg for work)... and realize I lost it. Oh well, it's OK, it will come back again in the future. I can be frustrated, or PO'd - but only for a few minutes, then I need to get over it. ~Jan