Ian, do you know for certain that the seller was aware you needed it? Could this have just been a case of "let's throw it up on eBay with a ridiculous reserve to test the waters and see what it's worth?" Unless you're 100% positive about the seller's motivation, statements like, "Quite frankly I think it's extortion" and "Pure highway robbery!!!" could get you sued for libel / slander!
Whatever the case, this was clearly an instance when you should have walked away. Seeing as how you were bidding against yourself, I don't think that book would have gone for more than the $22 it's listed at in the guide were you not aware of its sale. If the seller truly had no clue as to your needing the book, you could have then swooped in privately after the auction ended (without meeting reserve) and offered what you felt to be "fair" market value for it. On the other hand, if the seller was truly trying to extort you, your walking away would have put all of the power into your hands. At the very least it would have shown other would-be "extorters" that you are not afraid to walk away from books on your list and thus make them think twice about setting such high reserves in the future. At best, your refusing to meet the seller's reserve may have actually enabled you to open a negotiating track with him that would have netted you the book for substantially less than you ended up paying for it.
Ian, your quest is still a marathon, and despite your wanting to sprint to the end you need to keep a slow and steady pace. Otherwise you're going to stroke out!
Oh, and you do know they have medicine out there now to control OCD, right?
Alan