In auctions here is South Florida they advertise something like :
Home XXXXXXXX (auction #)
Appraised at $400,000 on xx/xx/xx (date)
Starting bid $2000
What they don't advertise is that sometimes the reserve on it is something like $360,000.
Or winning bid must be a cash sale only.
Or you have to finance with a certain bank and the loan will be adjusted "according to market value" which could leave you holding the bag big time should it soar back up.
Sometimes they trap you with a contract of not reselling the property for XXX amount of time (which can help trap you if you get hit by an adjustable loan).
Or you are responsible for all "closing costs" incurred by the bank because it went into foreclosure. These can be legal costs it took to evict the previous people, cost of repairs, unpaid bills.
When it seems too good to be true, it generally is. You should go just out of curiousity and see what the catch to the whole thing is. Report back. It would be interesting to see how these people are getting their money out of such a cheap sale.