Yeah - figure any ships for sale at the pirate shipyard are probably stolen. On that note, there could be anything there.
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The numbers I gave do not really increase the number of surrendered ships. Morale drops based on damage taken, not number of hits. True that the ships that do surrender or are boarded will tend to be in a little better hull condition (a LITTLE better, not much) - but all the guns will still be disabled and rigging/masts shot up, and the greatly reduced number of surrendered crew can make them tough to get back to port safely. It seems to about balance, at least from what I have seen.
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The numbers I gave do not really increase the number of surrendered ships. Morale drops based on damage taken, not number of hits. True that the ships that do surrender or are boarded will tend to be in a little better hull condition (a LITTLE better, not much) - but all the guns will still be disabled and rigging/masts shot up, and the greatly reduced number of surrendered crew can make them tough to get back to port safely. It seems to about balance, at least from what I have seen.