What is the main conflict in The Alchemist by Paulo Coelho?

I
believe that the main conflict in 's  is Santiago's personal, inner
struggle with completing his Personal Legend.  That internal man vs. self conflict is constantly
bombarded with external man vs. man conflicts, but the main struggle deals with Santiago
continually wondering if the journey is worth the trouble.  Santiago is met with all manner of
obstacles as he travels to Egypt where he thinks a great treasure can be found.  Along the way
he comes across desert wastelands, marauding bandits, and other life threatening obstacles.  He
is left beat up and without any money several times.  Santiago is left multiple times wondering
if he should continue on his journey or if he should just return home.  

There's a constant tension within Santiago in which he has to weigh the possibility of
finding an actual treasure vs. the treasures and knowledge that he has already gained.   That is
what I believe the central conflict of the story is.