Scupper: I have a 1983 Pacific Seacraft 37. When pulled for the survey it had hundreds of blisters. I bit the bullet and bought the boat anyway after also doing a lot of reading about blisters and alternatives to repair. In the end I thought "have you ever heard of a boat that sank due to blisters?" Really it comes down to resale value.
When it came to repair the Yard was really pushing for me to do the high end $$$$ repair where you remove layers of laminate. I opted for sandblasting then repairing any individual blisters that remained. Cost was around $10K. So far so good. So if you buy the boat make sure wthey come down on the price so you can do the blister repair.
I really liked this article:
Sea Lake Yacht Sales (Kemah, TX)