As some of you may remember, I was very active in the ebay classic PCDP scene a couple of years ago. I acquired a collection of 25-30 classic PCDP's, including the D-303, D-555, D-5, D-25, D-10, D-88, and many more. I didn't really keep track of who I was bidding against, at least whether or not they were from Head-Fi, but occasionally I would run up against a fellow Head-Fier that I recognized, and it usually didn't matter to me. If I was bidding on an item I already had one or two of, I'd sometimes back down, but more often than not, since I had more disposable income at the time (than I do now), I'd usually get the item.
It was during this period of time I learned to snipe. I didn't know what it was called at the time, but after awhile, I learned it was the only way to bid. I had countless auctions jerked out from under me at the last second, so since I couldn't beat them, I joined them. Anymore with whatever item I'm bidding on, whether car parts or electronics, I seldom bid until the last minute.
To me a bidding war, whether with a fellow Head-Fi member or a total stranger is total foolishness, benefiting no-one but the seller. I agree with the idea to post your maximum purchase price and then forget it, but I would have to add, wait until the last minute to do so.
The way I look at it, if Head-Fiers want to get together and decide not to run bids up, or not to bid against eachother, that is fine, but someone else is likely to jump in and get it then. I think some communication could be helpful in a few situations, but for the most part, its every person for themselves on ebay, try to be a nice guy, and someone else is likely to jump in and get the item.
-Keith