crack at base of swing keel n 1990 daysailer

Hi,
I am thinking of buying a 1990 daysailer on ebay. However, there is a crack at the base of the swing keel housing. The bid now is at $750, less than an hour to go. Looks like a decent boat from the photos - trailer included. My question - how serious an issue does this present? This is the area most sensitive to pressure in the hull. Here is a picture.
Thanks folks!
Bill
I am thinking of buying a 1990 daysailer on ebay. However, there is a crack at the base of the swing keel housing. The bid now is at $750, less than an hour to go. Looks like a decent boat from the photos - trailer included. My question - how serious an issue does this present? This is the area most sensitive to pressure in the hull. Here is a picture.
Thanks folks!
Bill