[percept]

This would be very useful to me and I would pay extra for it.

Most of the items I buy have \"best offer\" enabled.

But, you have to go back and forth with the seller, and this is very inconvenient. I would like to be able to escalate from say 60% to 80% of the price and get the lowest possible offer.

Being able to delay an offer until the item has been up for a couple days would be useful, because a seller will not usually take offers immediately.