The fix isn't the end of the world type thing. I heard one guy say that he had a boat yard fix his and it cost about $ 850.00. You may want to consider joining the Seafarer email list that is available on this site. They are a lively bunch and are a wealth of information about this kind of thing. The last time that I heard them reference the this fix, they were discussing having several of the pieces in question made up and selling them at cost to other Seafarer owners as we are all in the same boat more or less.
Again this is not a reason to turn the boat down, but it is unquestionably something that needs to be looked at. It may well be that the current owner has already done the fix.