"I once ran a solo game. The guy generated a 5 term Navy character. After mustering out, he took passage to an industrial world where he bought a house. He then found a job working at a shipyard where he could apply his mechanical skills.Fantastic!
He then bought a car. On his first day off of each week he did his household chores. That night he would participate in some form of entertainment. The other day off was rest.
He kept doing this week after week. I kept waiting for him to do some sort of adventurer-esque activity.
I finally asked him what he was trying to achieve. His response was that he was proving that in Traveller a player can do literally anything that the player wants to do, provided that the player is ready for the consequences."
Now, that doesn't sound like my kind of adventure, but sure, why not? Also, note that all the referee would need to give his player the 'adventure' he wanted was books 1-3 and some imagination.
The thread also has some good posts about what 'character advancement' looks like in Traveller, as compared with level-based game systems. I wrote about this a while back, too.