They’re capable of it Shadowcat. IIRC CbtSS has the PCs encounter a small island of pirates with a couple of skimmers for starters. The Athas.org team suggested that some of Eldaarich’s skimmer fleet act as pirates when they can get away with it too.
Break Shore, Cromlin, Alfala and a host of other shore towns can be excellent staging posts for a pirate campaign.
With some work you could adapt Dungeon Magazine’s DS adventure “Raiders of the Chanth” for PC orivateers.
Also have a look at Al-Qadim boxes to adapt - years ago I played in a converted “Corsairs of the Great Sea”, “Ruined Kingdoms” and “Cities of Bone” mashup - it works surprisingly well in Dark Sun with a bit of work. Having Tisan, the Arch-Geomancer bad gal in RK be an acolyte of Rajaat who actually succeeded in tapping into Athas’ own planetary energy makes for some high risk campaign consequences if the PCs screw up.
Anyway, sorry for going off on a tangent. Yes skimmer pirates exist. Yes you can easily do a skimmer pirate/privateer campaign. Good luck!