it takes a while to get the roll of the game.
I started off making 10k-30k per game, then eventually made my way to 60-80k.
once I switched to a 4 way, I can make it to 120k
try and get all the bonus items, and on high score decks, work on getting the most points with the captains, and get all the bonus items.
also, if you come across the item to make you invulnerable, still use the barrels to knock out pirates, which will get 200, compared to the 100 for walking into them.
and cascades. get more than one with a single barrel to really rack up, expeically high point decks, which are every 4 decks afaik.