Assignment of Bid ; thoughts

[Gil Lieblich]

I am about to close on a property using the assignment of bid. After going to some foreclosure auctions I tracked down some one who seemed to be involved heavily with these auctions on both sides. Is there anything I should be wary of when doing an assignment of bid? How much premium is considered normal over the original bid if the winning bid was 73000?
Who pays for late taxes and other fees?