When I was investigating foreclosures it did seem that a lot of houses that went to auction were sold for a higher amount than the original asking price. I know this is counter intuitive because the auction is further along in the process of the owner cutting the price to make it more sell-able, but I guess there is that whole auction fever thing going on. So, it is possible ProfJohn is right and auction house is trying to preserve the auction and get their cut.
Putting contingencies on offers for foreclosures is usually frowned on by the sellers. Here, in one of the foreclosure hotbeds sellers will usually accept the first full price offer that has no contingencies. However, it being a buyer's market you could counter offer for a lower earnest money deposit unless you feel there is some interest in other buyers who want this property too.
When I bought mine a year ago they only wanted $1K earnest money, but there were 4 other people touring the house the first day it went on the market. So, I gave a full price offer with no contingencies and heard that they accepted just a couple of hours later.