Yeah, I know, it's probably dangerous to give away any ebay tips here, to this bunch, of all people, but what the hell. I've bid and lost far more than I've bid and won, so I go into each auction figuring I'll lose.
One thing I've learned in 8 years of buying on ebay, there's always another -- whatever it is. You might think, "this is the only time I'll EVER see this on ebay!" But it's usually not. As long as you remember that, you can do fine on there.