Spelljammer is much more than just adventure and killing pirates. Sometimes running a business (or being a pirate) is your only form of income. Say you (a group of pirates who are down on your luck and have nothing to your name, run across a whaleship crewed by humans. Well you captured the boat, have the crew in irons and are gathering valuables off the richer passengers. If your lucky you might get a couple thousand gp worth of stuff, but ship repairs, ammo, new crew, food and taxes? Not going to cut it. Turns out that whaleship was stuffed to the brim with goods such as tobacco and rice sent off to some war effort. You could have gained at least 10000 if not more right there. That merchants wife can now afford to get a better necklace that you stole.