I did actually, thats why have referred it to a lawyer. Don't have enough legal experience otherwise.
I do think the 60 days after auction is a good clause to prevent dealing on the side. Unless i missed something. Also, you can always terminate the agreement in writing, I assume fax/regd. post would work for that.
Though this is probably why they're asking people to fax/mail in the agreement instead of an online approval as usual.