LadyG,
A couple of months ago I bought my current boat, likely a bit older than yours-to-be, (and for a little less money) it was a well maintained one-owner from new boat.
Being a little bit sensible I insisted on a full survey as I didn't really fancy any big projects in the immediate future.
The hull sides were very good with minimal pitting, the base plate was a different story with a 'rash' (surveyors own word) of pitting along the length of the base, some deep enough to warrant overplating. There were a couple of other relatively minor issues that needed addressing 'in the near future' but otherwise a nice boat for her age.
The survey allowed me to negotiate £8K off the asking price - the overplating etc. cost to put the boat mainly right. (She is being completely overplated - bottom and sides to the waterline)
Prior to 3 trips through the Harecastle Tunnel the boat was beautifully presented in paintwork and fresh hull blacking... (but that is another story)
So spending £700+ prior to purchase proved a worthwhile expense.
Like many others have said before, the boat chose me (I had looked at quite a few in the past too) as soon as I boarded her, now I am waiting patiently to get her into her slot for overplating and only doing little trips out until then, but once all is done that will certainly change!
Just as an aside, there is no shoreline connection on the boat so Galvanic Erosion was not suspected...
May I suggest you have a survey done, just in case?