As a alliance I can pretty much see multiple vendors spawned near Flynn in Boralus who sell stuff like pets, mounts, salvages, heirloom items, quest items etc. for doublons like Captain Klarisa or Captain Nightrunner. So yes, you can spend your hard earned doubloons there.While it is possible to solo Island Expeditions as a F2P alliance by getting Flynn to appear, the vendor is not available to spend your dubloons.
Horde has vendor available so you buy mounts/pets/transmogs.
Lv 10/11 twink arcane mage makes a mockery of the Island Expeditions.