Depends
Fixing delamination in the deck is never an easy job, but it may not be necessary. The amount and location of the delamination will determine if it is necessary to fix at all. For a 30' boat that you intend to cruise, I would ask for assistance from a professional surveyor. My surveyor found delamination in the deck of my boat during the pre-purchase survey, but it was easy to see where the water got in and how to remedy the problem. Combined with its small size in a non-critical area and my intented use of the boat, he told me it wasn't a big deal. Cracks around the mast could be a big problem if they are structural. I don't need a surveyor to tell me that I should stay away from that boat unless I want to undertake some serious repair work. However, if the cracks are just cracks in the gelcoat, that is purely cosmetic. Again, if you really like the boat, get a surveyor to tell you what you are looking at before you buy or reject.
