What if there were? Personally, I think experience should be accumulated in your crew, preserved if you strike, but lost entirely if the ship is destroyed. This would be a core mechanic in encouraging players to strike rather than fight to the death. Combine this with a severe disincentive to reject an opponents surrender, and we will have much more interesting win-loss dynamic. In fact, the disincentive to reject surrenders could be the same as the incentive to strike: you destroy a striking a ship and your crew deserts you refusing to serve under a dishonorable captain, causing complete loss of accumulated experience.
There could be material incentives on both sides, as well, of course. For example, you sink and you lose easily "portable" wealth (e.g. gold, silver, jewels) and your cargo, while your opponent gains nothing (no floating cargo salvage BS). Sinking a ship should be lose-lose, not a normally sought outcome but an exceptional occurrence in extreme circumstances. Strike and you keep your portable wealth and your opponent gains your cargo.