I resent the implication that those of us sellers using the second chance offer are trying to scam you buyer. I have over 2500 positive feedbacks, and I have yet to screw any one. Last week I sold a half dozen bucks, and so far, according to feedback and messages, all buyers are happy.
The second chance offer came about from ebay because some buyers, yours truly included, would sell an item, then, having the screen names of the losers, would offer them a same item. Worked fine, but ebay was losing out. So the not perfect present system was began, where the 'winner' of an auction is actually the loser because he pays more for an item than the people he out bid. I agree there should be a better way, but as long as the system is in place, and I am offering the EXACT SAME KINDA OF ITEM, I see no reason not to make such second chance offers. And many, many ebay buyers are on board with this.
I see on any forum concerning the use or collecting of certain items, complaints about ebay sellers. I don't like it. I could go on and on about bad buyers, but what the heck, I think I have made my point.
I will add that shill bidding is much, much harder to pull off than what you buyers may think it is.