I'm going to be running a seafaring campaign where there

Thieves.

Bail money.

Having to buy an entirely new (possibly bigger) ship after some kind of awesome boss fight (kraken, pissed-off intelligent whale, dire termites etc.).

>>50184109
scorbut

Remember to keep necessary expenditures proportional to the kind of loot they're raking in. Money for provisions, munitions, crew wages, port fees, occasional repair and rigging work, all that stuff. If the campaign is going to be all about the cash money, don't handwave the party having to -spend- that money.

If they still just get Too Rich then start setting higher goals for them. Expensive new ships and fittings. Buying out enterprises. Bribing entire port authorities.

Make the party pay to maintain a ship and crew. Damaged sails need replaced. Nails, pitch, lumber, and tools are needed for repairs. Crews need food, rations, rum, and clothing. Old Marvin died and needs a funeral. Maggie lost her leg to a shark and needs a peg-leg. Cannonballs and gunpowder for the guns, medicine and treatment for the wounded.

There should be plenty of costs that can help you keep the profits from becoming outrageous. If the players become obscenely wealthy, then that will make them a target for pirates, privateers, and thieves.

>>50185164
>pissed-off intelligent whale
>dire termites

I like the way you think.

Try to think of things that will make them WANT to spend their money. Give them opportunities to add all sorts of awesome-looking shit to their ship, let them take unusual pets. If there are gods in your setting, consider having one of them grant favors in exchange for "donations".

>>50184109
How about burying it on uninhabited islands in case of a bad time.
Or splitting the loot with the crew every now and then at port.

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>>50185615
This is a good one.

Consider the following:
A local king is wanting to sell off an island that offers little more than a place to exile undesirables.
I'd bet the PCs want to buy that island and make it a base of operations.

If they build bars and brothels, their men will have higher morale scores. (If you aren't considering morale of an NPC group this large, shame on you.)
If they build a smithy and hire a blacksmith, the crew will always have access to well-crafted and well-maintained weapons.
If they hire an esteemed tailor and give him a wee shop, the crew could have impeccable fashion.