The real estate auction goes very fast, and unless you are knowledgeable about how the auction works, it may appear that the winner has been prearranged. Most times the bid for the real estate must be accompanied by a sizable earnest money deposit.
If you are the successful bidder you will be expected to be responsible for removing the current occupants of the building. These may be the former owners, legitimate renters, or people who are illegally using the property. This removal may entail legal eviction proceedings or cash payouts to get the occupants to leave.
By far the worst part is that usually the home being auctioned off is not available for inspection prior to the auction. This means that you could end up with property that has severe structural defects. If you want to purchase foreclosed real estate this way, consult with a real estate attorney and real estate agent who are familiar with how the auctions work.