I was in a similar situation before Christmas, basically the EA said our first offer was ridiculous. God love him he was a bit thick and between myself & hubby we found out how much the property had gone sale agreed for in June (this fell through as purchasers finance didnt work out.)
We then topped 7K onto our original offer - still below asking price and said it was our final offer, it was accepted.
I know this wouldnt always work and EAs differ - as I said ours was more than a bit dim!
BUT we also had another property we were bidding on where they kept pushing it up and up and up, then he rang and lied it was sale agreed, I see that property is now back on the market for less than our final bid.
That seller was in no rush and IMO very greedy, the EA was no better, and had his eye firmly fixed on his commission.
I think it is up to us the public to play them at their own game, they have had it too easy for too long. We shouldn't be afraid to offer less, most properties are so overvalued as it is.
When we were selling our EA was extremely pushy and insisted on marketing out property for about 15K more than I would have dreamed of asking for, I felt sick! In fairness it worked out but they really have been causing alot of the price escalation for along time!!
Just my tuppence worth