As a few others stated, it would probably decent if the basic accounts, could purchase any "light" class vessels. However I would quickly point out that the poll'ers comment himself explains why you cant.
"...and I might ask my parents if I could get unlimited access."
Because he wants the bigger ships... sounds to me like the business model is working in this regard.
Zeppers lvl 40 - All mastered but lvl 21 cannons
Groggy McJones lvl 26 - All weapons quest/tp quest finished - avoiding story quest
http://pirates.teamofx.us