the issue i have with increasing the logbook money is that it encourages random sinking of people who might not have anything on board, including just loaded into the game and still at dock
yes, it happens already, but once you tie a significant monetary reward to it it will be incentivized and rewarded. I think the logbook should remain a little bonus on top of whatever you get from the ship you sunk, instead of a reason to sink it
currently if someone spyglasses you, it's not guaranteed your'e getting anything worthwhile from sinking them, especially if they aren't running an emissary flag, but if you increase the reward too much then it'll be immediate 'sink every captained ship you see'
unlike Emissary, which gives you a extra gold and reputation reward for using, AND can be opted into and out of at will while in a session, being a captain has to be done on the main menu without knowledge of the server you're going into, cannot just be lowered if you don't want to be a Reaper's target, and doesn't give you any benefits since it just tracks stats
TL:DR: Logbooks should not be a huge reward and a reason to sink people, but instead a bonus loot on top of whatever you got from sinking the ship in the first place. They should not be a 'emissary flag 2.0' with all the risks and none of the rewards