When I completed the tutorial quests, except for the last one, I was given about 250,000 credits through the quests. This is enough to buy virtually any of the ships from the vendor.
But with the prices of the NPC's/Droids/Equipment it can be very easy to use all of those credits. The player is introduced to combat with bandits and creatures very early; so it is possible, in the spirit of playing and experiencing the game, to use all your credits and lose any npc's you bought. This combined with being stunned if your health drops to 1, daily health regeneration and creatures/bandits not respawning when other players are idling/inactive in the wild areas would make it extremely time consuming to earn more credits.
Unless there are more ways to earn credits, other than hunt bandits/creatures and the initial quests?
So if you do not have the credits to buy a ship is there any way to leave the tutorial world?