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[quote="Snu"]I'm following up here on the last suggestion I posted, for changing contingency groups.  Unlike that one, this suggestion very likely [i]would[/i] increase the burden on the server, but perhaps the increase would be small enough that it could still work out.

When bidding on auctions with a combined shipping discount, it can make sense to change your bid depending on past auctions.  For example, if a seller discounts any won auctions beyond the first by $3, then you might well want to raise your bids on their items by $3 if you already won one of their auctions.  Or if a seller has a fixed rate of $5 for shipping regardless of the number of items you purchase, than you could bid (value to you - $5) on any items until you have a high bid, then switch to bidding (value to you) afterward.

A good (not completely ideal, but likely close enough) way to handle this could be through contingency groups which change bids instead of cancelling them. The user would need to choose a contingency group number along with a contingent bid change. If any item in the contingency group is won, then the bid change would be applied to all future items in that group.  Here's a flowchart-like look at the way this could be handled after a auction from a contingency group completes:

[list]Was the item won?

No: No changes occur to any other auctions in the bid group.

Yes: All remaining auctions in the bid group A) have the contingent bid change added to their bid, and B) have their group set to 0 (i.e, the grouping is removed).[/list]
Of course, this would mean there would need to be an extra field -- the amount to change later contingency bids -- associated either with each Gixen's bid records, or perhaps just for each contingent bid group.  That would certainly mean more resources, though maybe not so much as to be a burden.

But if it works out, it would be very handy for me, and I suspect for other users, as well!  This scheme could also be managed using scripting and the new Gixen APIs, but that has the usual drawbacks of automating auctions on a local machine.[/quote]

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